chore(deps): Bump actions/setup-python from 2 to 3 (aws#3405)

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 2 to 3.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/actions/setup-python/releases">actions/setup-python's releases</a>.</em></p>
<blockquote>
<h2>v3.0.0</h2>
<h2>What's Changed</h2>
<ul>
<li>Update default runtime to node16 (<a href="https://github-redirect.dependabot.com/actions/setup-python/pull/340">actions/setup-python#340</a>)</li>
<li>Update <code>package-lock.json</code> file version to 2, <code>@types/node</code> to 16.11.25 and <code>typescript</code> to 4.2.3 (<a href="https://github-redirect.dependabot.com/actions/setup-python/pull/341">actions/setup-python#341</a>)</li>
<li>Remove legacy <code>pypy2</code> and <code>pypy3</code> keywords (<a href="https://github-redirect.dependabot.com/actions/setup-python/pull/342">actions/setup-python#342</a>)</li>
</ul>
<h3>Breaking Changes</h3>
<p>With the update to Node 16, all scripts will now be run with Node 16 rather than Node 12.</p>
<p>This new major release removes support of legacy <code>pypy2</code> and <code>pypy3</code> keywords. Please use more specific and flexible syntax to specify a PyPy version:</p>
<pre lang="yaml"><code>jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        python-version:
        - 'pypy-2.7' # the latest available version of PyPy that supports Python 2.7
        - 'pypy-3.8' # the latest available version of PyPy that supports Python 3.8
        - 'pypy-3.8-v7.3.8' # Python 3.8 and PyPy 7.3.8
    steps:
    - uses: actions/checkout@v2
    - uses: actions/setup-python@v3
      with:
        python-version: ${{ matrix.python-version }}
</code></pre>
<p>See more usage examples in the <a href="https://github.com/actions/setup-python#specifying-a-pypy-version">documentation</a></p>
<h2>Update primary and restore keys for pip</h2>
<p>In scope of this release we <a href="https://github-redirect.dependabot.com/actions/setup-python/pull/303">include a version of python in restore and primary cache keys for pip</a>. Besides, we add temporary fix for Windows caching <a href="https://github-redirect.dependabot.com/actions/setup-python/pull/332">issue</a>, that the <code>pip cache dir</code> command returns non zero exit code or writes to stderr. Moreover we updated <a href="https://github-redirect.dependabot.com/actions/setup-python/pull/327">node-fetch dependency</a>.</p>
<h2>Update actions/cache version to 1.0.8</h2>
<p>We have updated <a href="https://github.com/actions/toolkit/blob/main/packages/cache/RELEASES.md#108">actions/cache</a> dependency version to 1.0.8 to support 10GB cache upload</p>
<h2>Support caching dependencies</h2>
<p>This release introduces dependency caching support (<a href="https://github-redirect.dependabot.com/actions/setup-python/pull/266">actions/setup-python#266</a>)</p>
<h2>Caching dependencies.</h2>
<p>The action has a built-in functionality for caching and restoring pip/pipenv dependencies. The <code>cache</code> input is optional, and caching is turned off by default.</p>
<p>Besides, this release introduces dependency caching support for mono repos and repositories with complex structure.</p>
<p>By default, the action searches for the dependency file (requirements.txt for pip or Pipfile.lock for pipenv) in the whole repository. Use the <code>cache-dependency-path</code> input for cases when you want to override current behaviour and use different file for hash generation (for example requirements-dev.txt). This input supports wildcards or a list of file names for caching multiple dependencies.</p>
<h3>Caching pip dependencies:</h3>
<pre><code>steps:
- uses: actions/checkout@v2
- uses: actions/setup-python@v2
  with:
    python-version: '3.9'
&lt;/tr&gt;&lt;/table&gt; 
</code></pre>
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/actions/setup-python/commit/0ebf233433c08fb9061af664d501c3f3ff0e9e20"><code>0ebf233</code></a> Remove legacy PyPy input (<a href="https://github-redirect.dependabot.com/actions/setup-python/issues/342">#342</a>)</li>
<li><a href="https://github.com/actions/setup-python/commit/665cd78205d9937a51af8cdb754840e2bc95c2d5"><code>665cd78</code></a> Update lockfileversion (<a href="https://github-redirect.dependabot.com/actions/setup-python/issues/341">#341</a>)</li>
<li><a href="https://github.com/actions/setup-python/commit/93cb78f17ba30b733a6c17d0f21183bdc0140887"><code>93cb78f</code></a> Update to node16 (<a href="https://github-redirect.dependabot.com/actions/setup-python/issues/340">#340</a>)</li>
<li>See full diff in <a href="https://github.com/actions/setup-python/compare/v2...v3">compare view</a></li>
</ul>
</details>
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</details>

.github/workflows/gh-pages.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Set up Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v3
         with:
           python-version: '3.8'
       - name: Check out

.github/workflows/main.yml

@@ -46,7 +46,7 @@ jobs:
           cache: yarn
           node-version: '12'
       - name: Set up Python 3.6
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v3
         with:
           python-version: '3.6'
       - name: Install python3-venv
@@ -140,7 +140,7 @@ jobs:
           cache: yarn
           node-version: '12'
       - name: Set up Python 3.6
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v3
         with:
           python-version: '3.6'
       - name: Install python3-venv
@@ -308,7 +308,7 @@ jobs:
           cache: yarn
           node-version: ${{ matrix.node }}
       - name: Set up Python ${{ matrix.python }}
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v3
         with:
           python-version: ${{ matrix.python }}
       - name: 'Linux: Install python3-venv'