Bump codecov/codecov-action from 5 to 6

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 5 to 6.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v5...v6)

---
updated-dependencies:
- dependency-name: codecov/codecov-action
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Install Node dependencies
         run: npm ci
       - run: node --test --experimental-test-coverage --test-reporter=spec --test-reporter=lcov --test-reporter-destination=stdout --test-reporter-destination=lcov.txt
-      - uses: codecov/codecov-action@v5
+      - uses: codecov/codecov-action@v6
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           flags: javascript
@@ -56,7 +56,7 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
       - run: uv run --with django~=${{ matrix.django-version }}.0 pytest -m "not selenium"
-      - uses: codecov/codecov-action@v5
+      - uses: codecov/codecov-action@v6
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           flags: python
@@ -72,7 +72,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: astral-sh/setup-uv@v7
       - run: uv run pytest -m selenium
-      - uses: codecov/codecov-action@v5
+      - uses: codecov/codecov-action@v6
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           flags: selenium-${{ matrix.os }}