Updated GitHub Actions to use Node v14.

Author: reduckted

.github/workflows/ci.yml

@@ -26,7 +26,7 @@ jobs:
             - name: Install Node.js
               uses: actions/setup-node@v1
               with:
-                  node-version: 12.x
+                  node-version: 14.x
 
             - name: Install dependencies
               working-directory: ./vscode

.github/workflows/publish.yml

@@ -14,7 +14,7 @@ jobs:
             - name: Install Node.js
               uses: actions/setup-node@v1
               with:
-                  node-version: 12.x
+                  node-version: 14.x
 
             - name: Install dependencies
               working-directory: ./vscode