Update node step in the Build VSIX action

.github/workflows/main.yml

@@ -21,7 +21,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Setup Node.js environment
-        uses: actions/setup-node@v1.4.3
+        uses: actions/setup-node@v2.1.2
   
       # Runs a single command using the runners shell
       - name: Build the VSIX