ci: bump Node to 14.x (#1122)

.ado/azure-pipelines.publish.yml

@@ -20,7 +20,7 @@ jobs:
     steps:
       - task: NodeTool@0
         inputs:
-          versionSpec: '12.x'
+          versionSpec: '14.x'
         displayName: 'Install Node.js'
 
       - script: |

.ado/templates/setup-repo.yml

@@ -2,7 +2,7 @@
 steps:
   - task: NodeTool@0
     inputs:
-      versionSpec: "12.x"
+      versionSpec: "14.x"
     displayName: "Install Node.js"
 
   - task: NuGetToolInstaller@0
@@ -10,4 +10,4 @@ steps:
       versionSpec: "5.6.0"
     displayName: "Install Nuget"
 
-  - template: yarn-install.yml
+  - template: yarn-install.yml