ci: Skip smoke tests for Swift 6.1

Author: euanh

.github/workflows/pull_request.yml

@@ -22,7 +22,7 @@ jobs:
             linux_5_9_enabled: false
             linux_5_10_enabled: false
             linux_6_0_arguments_override: "--skip SmokeTests"
-            linux_nightly_6_0_arguments_override: "--skip SmokeTests"
+            linux_nightly_6_1_arguments_override: "--skip SmokeTests"
             linux_nightly_main_arguments_override: "--skip SmokeTests"
 
     # Test functions and modules against an separate registry