Bump codecov/codecov-action from 4 to 5

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 4 to 5.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v4...v5)

---
updated-dependencies:
- dependency-name: codecov/codecov-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/pythontests.yml

@@ -49,7 +49,7 @@ jobs:
         TOX_PYTHON_VERSION=$(if [[ ${{ matrix.python-version }} == pypy* ]]; then echo ${{ matrix.python-version }} | tr -d .-; else echo py${{ matrix.python-version }} | tr -d .-; fi)
         COV_CMD=$(if [ ${{ matrix.python-version }} == 3.10 ]; then echo "--cov=./pytest_order/ --cov-report=xml"; else echo ; fi) tox -e $(tox -l | grep "$TOX_PYTHON_VERSION" | paste -sd "," -)
     - name: Upload coverage to Codecov
-      uses: codecov/codecov-action@v4
+      uses: codecov/codecov-action@v5
       if: ${{ success() && matrix.python-version == 3.10 }}
       with:
         env_vars: OS