deps: Update codecov/codecov-action action to v7

Author: renovate[bot]

.github/workflows/ci.yml

@@ -90,7 +90,7 @@ jobs:
 
             -   name: Upload coverage to Codecov
                 if: always()
-                uses: codecov/codecov-action@fb8b3582c8e4def4969c97caa2f19720cb33a72f # v6
+                uses: codecov/codecov-action@fb8b3582c8e4def4969c97caa2f19720cb33a72f # v7
                 with:
                     files: ./Artifacts/coverage/PaperlessREST.Tests/coverage.cobertura.xml,./Artifacts/coverage/PaperlessServices.Tests/coverage.cobertura.xml
                     flags: backend