chore(workflows/tests): update coverage node version

Author: hasezoey

.github/workflows/tests.yml

@@ -49,7 +49,7 @@ jobs:
         env:
           CI: true
       - name: Send codecov.io stats
-        if: matrix.node-version == '12.x'
+        if: matrix.node-version == '14.x'
         uses: codecov/codecov-action@v3
 
   publish: