Correct rubocop offenses

Author: aguspe

rb/lib/selenium/webdriver/bidi/network.rb

@@ -100,9 +100,9 @@ def continue_with_response(**args)
           )
         end
 
-        def on(event, &block)
+        def on(event, &)
           event = EVENTS[event] if event.is_a?(Symbol)
-          @bidi.add_callback(event, &block)
+          @bidi.add_callback(event, &)
           @bidi.session.subscribe(event)
         end
       end # Network

rb/sig/lib/selenium/webdriver/bidi.rbs

@@ -7,7 +7,7 @@ module Selenium
 
       def initialize: (url: String) -> void
 
-      def add_callback: (String event) { () -> void } -> Integer
+      def add_callback: (String | Symbol event) { () -> void } -> Integer
 
       def close: () -> nil