Fix warnings on publish. Closes #112

Closes #112

Author: garrytrinder

.github/workflows/publish.yml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Install Node.js
       uses: actions/setup-node@v4