Update plugin-linting.yml

Author: angusmcleod

.github/workflows/plugin-linting.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Set up Node.js
         uses: actions/setup-node@v1
         with:
-          node-version: 12
+          node-version: 14
 
       - name: Set up ruby
         uses: ruby/setup-ruby@v1