Update workflow to copy README to Wiki

Author: JulianPrieber

.github/workflows/copy-readme-to-wiki.yml

@@ -3,16 +3,16 @@ name: Wiki Sync
 on:
   push:
     branches:
-      - "master"
+      - "main"
   pull_request:
     branches:
-      - "master"
+      - "main"
 
 jobs:
   stale:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@master
+    - uses: actions/checkout@main
     - uses: JoeIzzard/ghaction-wiki-sync@v1
       with:
         username: LinkStackOrg