Prevent defining overwriten proxy/timeouts= methods in capabilities

Fixes warnings like these:

./rb/lib/selenium/webdriver/remote/capabilities.rb:204: warning: method redefined; discarding old proxy=
./rb/lib/selenium/webdriver/remote/capabilities.rb:52: warning: previous definition of proxy= was here
./rb/lib/selenium/webdriver/remote/capabilities.rb:215: warning: method redefined; discarding old timeouts
./rb/lib/selenium/webdriver/remote/capabilities.rb:48: warning: previous definition of timeouts was here

Author: p0deje

rb/lib/selenium/webdriver/remote/capabilities.rb

@@ -44,7 +44,7 @@ class Capabilities
           :remote_session_id
         ].freeze
 
-        KNOWN.each do |key|
+        (KNOWN - %i[proxy timeouts]).each do |key|
           define_method key do
             @capabilities.fetch(key)
           end
@@ -201,6 +201,10 @@ def merge!(other)
           end
         end
 
+        def proxy
+          @capabilities.fetch(:proxy)
+        end
+
         def proxy=(proxy)
           case proxy
           when Hash
@@ -216,6 +220,10 @@ def timeouts
           @capabilities[:timeouts] ||= {}
         end
 
+        def timeouts=(timeouts)
+          @capabilities[:timeouts] = timeouts
+        end
+
         def implicit_timeout
           timeouts[:implicit]
         end