Actions: Use main branch (#899)

Author: ryonakano

.github/workflows/release.yml

@@ -23,7 +23,7 @@ jobs:
         token: ${{ secrets.GIT_USER_TOKEN }}
 
     - name: Create Release
-      uses: elementary/actions/release@master
+      uses: elementary/actions/release@main
       env:
         GIT_USER_TOKEN: "${{ secrets.GIT_USER_TOKEN }}"
         GIT_USER_NAME: "elementaryBot"