Run tests on Python 3.13 release candidate

.github/workflows/ci.yml

@@ -12,15 +12,17 @@ jobs:
   build:
     runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11', 'pypy-3.9']
+        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12', '3.13', 'pypy-3.10']
 
     steps:
     - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
+        allow-prereleases: true
     - uses: actions/cache@v4
       with:
         path: ~/.cache/pip
@@ -32,11 +34,11 @@ jobs:
         python -m pip install tox tox-gh-actions
         sudo apt-get install libmemcached-dev
     - name: Lint
-      if: matrix.python-version == '3.10'
+      if: matrix.python-version == '3.12'
       run: |
         tox -e lint,mypy
     - name: Docs
-      if: matrix.python-version == '3.10'
+      if: matrix.python-version == '3.12'
       run: |
         tox -e docs
     - name: Disable IPv6 localhost