fix: update CI workflow to use 'master' branch instead of 'main'

Author: jlucaso1

.github/workflows/ci.yml

@@ -2,9 +2,9 @@ name: CI
 
 on:
   push:
-    branches: [main]
+    branches: [master]
   pull_request:
-    branches: [main]
+    branches: [master]
 
 permissions:
   contents: read