update workflows

.github/workflows/build.yml

 
     strategy:
       matrix:
-        node-version: [10.x, 12.x]
+        node-version: [14.x, 16.x]
 
     steps:
     - uses: actions/checkout@v2

.github/workflows/dev.yml

 
     strategy:
       matrix:
-        node-version: [10.x, 12.x]
+        node-version: [14.x, 16.x]
 
     steps:
       - uses: actions/checkout@v2