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] <[email protected]>

.github/workflows/ci.yml

@@ -464,7 +464,7 @@ jobs:
         uses: taiki-e/install-action@cargo-llvm-cov
       - run: python -m pip install --upgrade pip && pip install nox
       - run: nox -s coverage
-      - uses: codecov/codecov-action@v4
+      - uses: codecov/codecov-action@v5
         with:
           file: coverage.json
           name: ${{ matrix.os }}
@@ -582,7 +582,7 @@ jobs:
       - name: Generate coverage report
         run: nox -s generate-coverage-report
       - name: Upload coverage report
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v5
         with:
           file: coverage.json
           name: test-free-threaded