fix: Update branch name from 'main' to 'master' in GitHub Actions workflow

Author: dipaksarkar

.github/workflows/tests.yml

@@ -3,7 +3,7 @@ name: tests
 on:
   push:
     branches:
-      - main
+      - master
   pull_request:
   schedule:
     - cron: "0 0 * * *"