ci(github): downgrade codecov-action to v4 in default.yml

Author: bartventer

.github/workflows/default.yml

@@ -41,7 +41,7 @@ jobs:
 
  - name: Upload coverage reports to Codecov
  if: ${{ matrix.upload-coverage }}
- uses: codecov/codecov-action@v5
+ uses: codecov/codecov-action@v4
  with:
  token: ${{ secrets.CODECOV_TOKEN }}
  files: ${{ env.COVERAGE_DIR }}/${{ env.COVERPROFILE }}