Remove anyobject_protocol rule

The rule [has been deprecated](https://github.com/realm/SwiftLint/releases/tag/0.50.0).

Author: philium

.swiftlint.yml

@@ -28,7 +28,6 @@ disabled_rules:
 
 # Some rules are only opt-in
 opt_in_rules: 
-  - anyobject_protocol
   - array_init
   - attributes
   - closure_end_indentation