update github action

Author: sysid

.github/workflows/build.yml

@@ -4,17 +4,17 @@ name: build
 
 on:
   push:
-    branches: [master]
+    branches: [main]
   pull_request:
-    branches: [master]
+    branches: [main]
   workflow_dispatch:
 
 jobs:
   build:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8, 3.9, '3.10', '3.11']
+        python-version: [3.8, 3.9, '3.10', '3.11', '3.12']
 
     env:
       USING_COVERAGE: '3.10'