chore: 깃허브 액션 권한 수정

Author: realstone2

.github/workflows/main-to-merge.yml

@@ -32,3 +32,6 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+permissions:
+  contents: write
+  pull-requests: write