Bump Python 3.13

- Update the Python version in pyproject.toml and setup.cfg
- Update the Python version in .github/workflows/pypi-publish.yml
- `poetry update` to update the lock file
- Drop support for Python 3.8 https://devguide.python.org/versions/

.github/workflows/python-test.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python: ["3.9", "3.10", "3.11", "3.12", "3.13"]
 
     services:
       redis:
@@ -72,7 +72,7 @@ jobs:
         run: poetry run poe coverage-xml
 
       - name: Upload coverage report to Codecov
-        if: matrix.python == '3.12'
+        if: matrix.python == '3.13'
         uses: codecov/codecov-action@v4
         with:
           token: ${{ secrets.CODECOV_TOKEN }}