Fix deprecation warnings (#12339)

* Fix deprecation warnings in Images::Optimizer

The deprecation warnings were:

warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
warning: The called method `cloudinary' is defined here

and

warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
warning: The called method `imgproxy' is defined here

* Fix deprecation warning in Slack::Messengers::ArticlePublished

The deprecation warning was:

warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
warning: The called method `initialize' is defined here

app/services/images/optimizer.rb

@@ -4,9 +4,9 @@ module Images
       return img_src if img_src.blank? || img_src.starts_with?("/")
 
       if imgproxy_enabled?
-        imgproxy(img_src, kwargs)
+        imgproxy(img_src, **kwargs)
       else
-        cloudinary(img_src, kwargs)
+        cloudinary(img_src, **kwargs)
       end
     end
 

app/services/slack/messengers/article_published.rb

@@ -10,8 +10,8 @@ module Slack
         @article = article
       end
 
-      def self.call(*args)
-        new(*args).call
+      def self.call(**args)
+        new(**args).call
       end
 
       def call