chore: bump codecov/codecov-action from 6 to 7 (#5991)

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/tests.yaml

@@ -501,7 +501,7 @@ jobs:
           # accuracy is important.
           ${{ github.repository_owner == 'prql' && github.event_name !=
           'schedule' }}
-        uses: codecov/codecov-action@v6
+        uses: codecov/codecov-action@v7
         with:
           files: cobertura.xml
           fail_ci_if_error: true