Update release-branch-artifact.yaml

12 -> 14 (we have odd test errors on 12 that aren't worth debugging)

Author: weswigham

.github/workflows/release-branch-artifact.yaml

@@ -11,10 +11,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Use node version 12
+    - name: Use node version 14
       uses: actions/setup-node@v1
       with:
-        node-version: 12
+        node-version: 14
     - name: Remove existing TypeScript
       run: |
         npm uninstall typescript --no-save