remove @main

Author: euanh

.github/workflows/pull_request.yml

@@ -53,7 +53,7 @@ jobs:
 
     endtoend-tests:
         name: End to end tests
-        uses: apple/swift-container-plugin/.github/workflows/endtoend_tests.yml@main
+        uses: apple/swift-container-plugin/.github/workflows/endtoend_tests.yml
 
     swift-6-language-mode:
         name: Swift 6 Language Mode