Apply Rubocop Performance/StringIdentifierArgument (#23444)

app/lib/scope_transformer.rb

@@ -28,7 +28,7 @@ class ScopeTransformer < Parslet::Transform
     def merge!(other_scope)
       raise ArgumentError unless other_scope.namespace == namespace && other_scope.term == term
 
-      @access.concat(other_scope.instance_variable_get('@access'))
+      @access.concat(other_scope.instance_variable_get(:@access))
       @access.uniq!
       @access.sort!
 

lib/mastodon/statuses_cli.rb

@@ -93,7 +93,7 @@ module Mastodon
         c.table_name = 'statuses_to_be_deleted'
       end
 
-      Object.const_set('StatusToBeDeleted', klass)
+      Object.const_set(:StatusToBeDeleted, klass)
 
       scope     = StatusToBeDeleted
       processed = 0
@@ -175,7 +175,7 @@ module Mastodon
         c.table_name = 'conversations_to_be_deleted'
       end
 
-      Object.const_set('ConversationsToBeDeleted', klass)
+      Object.const_set(:ConversationsToBeDeleted, klass)
 
       scope     = ConversationsToBeDeleted
       processed = 0