ci: update codecov action version to v3

Author: Ananya2001-an

.github/workflows/test.yaml

@@ -44,7 +44,7 @@ jobs:
 
     - name: Upload coverage to Codecov
       if: "matrix.use_coverage"
-      uses: codecov/codecov-action@v4
+      uses: codecov/codecov-action@v3
       with:
         fail_ci_if_error: false
         verbose: true