(ci) bump node used for extensions deployment

vsce needs 14.x now

Author: dummdidumm

.github/workflows/DeployExtensionsProd.yml

@@ -13,7 +13,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2
         with:
-          node-version: "12.x"
+          node-version: "14.x"
           registry-url: "https://registry.npmjs.org"
           cache: yarn