Fix install of Python 3.10 on GitHub Actions

In PR #1604 the Python version was upgraded to Python 3.10 to fix a
local issue on M1 MacBooks.

The GitHub Action workflows now exit with the following message for the
docker-tests, spellcheck and lint checks, skipping these checks.

```
lint create: /home/runner/work/opentelemetry-python-contrib/opentelemetry-python-contrib/.tox/lint
SKIPPED: InterpreterNotFound: python3.10
___________________________________ summary ____________________________________
SKIPPED:  lint: InterpreterNotFound: python3.10
  congratulations :)
```

Upgrade the Python version in the GitHub Actions workflow to fix this.

.github/workflows/test.yml

@@ -102,10 +102,10 @@ jobs:
     steps:
       - name: Checkout Contrib Repo @ SHA - ${{ github.sha }}
         uses: actions/checkout@v2
-      - name: Set up Python 3.9
+      - name: Set up Python 3.10
         uses: actions/setup-python@v2
         with:
-          python-version: 3.9
+          python-version: 3.10
       - name: Install tox
         run: pip install tox==3.27.1
       - name: Install libsnappy-dev