Update SwiftLint config to ignore .build from SPM

Author: mokagio

.swiftlint.yml

@@ -3,6 +3,9 @@ swiftlint_version: 0.54.0
 parent_config: https://raw.githubusercontent.com/Automattic/swiftlint-config/0f8ab6388bd8d15a04391825ab125f80cfb90704/.swiftlint.yml
 remote_timeout: 10.0
 
+excluded:
+  .build # `swift build` etc. output folder
+
 opt_in_rules:
   - overridden_super_call
   - discarded_notification_center_observer