Update package butler

Author: davidanthoff

.github/workflows/jlpkgbutler-butler-workflow.yml

@@ -3,16 +3,18 @@ name: Run the Julia Package Butler
 on:
   push:
     branches:
+      - main
       - master
   schedule:
     - cron: '0 */1 * * *'
+  workflow_dispatch:
 
 jobs:
   butler:
     name: "Run Package Butler"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: davidanthoff/julia-pkgbutler@releases/v1
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}