ci: changed workflow branch to main

Author: Frank01001

.github/workflows/gh-pages.yml

@@ -5,7 +5,7 @@ name: GitHub Pages
 on:
   push:
     branches:
-      - master
+      - main
 
 jobs:
   build-deploy:
@@ -34,7 +34,7 @@ jobs:
 
       - name: Deploy
         uses: peaceiris/actions-gh-pages@v3
-        if: ${{ github.ref == 'refs/heads/master' }}
+        if: ${{ github.ref == 'refs/heads/main' }}
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_branch: gh-pages