Revert "chore: bump codecov/codecov-action from 3 to 4"

This reverts commit 7d5acd2.

Author: da2ce7

.github/workflows/coverage.yaml

@@ -83,7 +83,7 @@ jobs:
 
       - id: upload
         name: Upload Coverage Report
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v3
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           files: ${{ steps.coverage.outputs.report }}