ci: downgrade codecov/codecov-action (#345)

Author: G-Rath

.github/workflows/validate.yml

@@ -68,7 +68,7 @@ jobs:
         run: npm run lint:generate-readme-table
 
       - name: ⬆️ Upload coverage report
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v3
 
   release:
     needs: main