Revert codecov-action to v3

Author: brandonwillard

.github/workflows/test.yml

@@ -247,7 +247,7 @@ jobs:
           path: coverage
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v3
         with:
           directory: ./coverage/
           fail_ci_if_error: true