change test workflow branch

Author: jlc-christie

.github/workflows/test.yaml

@@ -1,7 +1,7 @@
 name: test
 on:
-  push: { branches: [v2] }
-  pull_request: { branches: [v2] }
+  push: { branches: [main] }
+  pull_request: { branches: [main] }
 jobs:
   check:
     runs-on: ubuntu-latest