Bump codecov/codecov-action from 5 to 6 (#21)

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -66,6 +66,6 @@ jobs:
               run: vendor/bin/phpunit --coverage-clover coverage.xml
 
             - name: Upload coverage to Codecov
-              uses: codecov/codecov-action@v5
+              uses: codecov/codecov-action@v6
               env:
                   CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}