change workflow version and branch name

Author: thacuber2a03

.github/workflows/umbox.yml

@@ -2,13 +2,13 @@ name: UmBox upload
 
 on:
   push:
-    branches: [ master ]
+    branches: [ main ]
 
   workflow_dispatch:
 
 jobs:
   upload:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
 
     steps:
       - uses: actions/checkout@v2