Fix code style.

Library/Homebrew/rubocops/cask/ast/cask_block.rb

@@ -8,7 +8,6 @@ module RuboCop
     module AST
       class StanzaBlock
         extend T::Helpers
-        extend T::Sig
 
         sig { returns(RuboCop::AST::BlockNode) }
         attr_reader :block_node

Library/Homebrew/rubocops/cask/extend/node.rb

@@ -5,8 +5,6 @@ module RuboCop
   module AST
     # Extensions for RuboCop's AST Node class.
     class Node
-      extend T::Sig
-
       include RuboCop::Cask::Constants
 
       def_node_matcher :method_node, "{$(send ...) (block $(send ...) ...)}"

Library/Homebrew/rubocops/cask/no_overrides.rb

@@ -21,7 +21,7 @@ module RuboCop
         def on_cask(cask_block)
           cask_stanzas = cask_block.toplevel_stanzas
 
-          return unless (on_blocks = on_system_methods(cask_stanzas)).any?
+          return if (on_blocks = on_system_methods(cask_stanzas)).none?
 
           stanzas_in_blocks = on_system_stanzas(on_blocks)
 

Library/Homebrew/rubocops/cask/stanza_grouping.rb

@@ -23,7 +23,7 @@ module RuboCop
           cask_stanzas = cask_block.toplevel_stanzas
           add_offenses(cask_stanzas)
 
-          return unless (on_blocks = on_system_methods(cask_stanzas)).any?
+          return if (on_blocks = on_system_methods(cask_stanzas)).none?
 
           on_blocks.map(&:method_node).select(&:block_type?).each do |on_block|
             stanzas = inner_stanzas(on_block, processed_source.comments)