Revert language mixins back to module_function

Library/Homebrew/language/perl.rb

@@ -8,7 +8,9 @@ module Language
   module Perl
     # Helper module for replacing `perl` shebangs.
     module Shebang
-      def self.detected_perl_shebang(formula = self)
+      module_function
+
+      def detected_perl_shebang(formula = self)
         perl_path = if formula.deps.map(&:name).include? "perl"
           Formula["perl"].opt_bin/"perl"
         elsif formula.uses_from_macos_names.include? "perl"

Library/Homebrew/language/perl.rbi

@@ -0,0 +1,9 @@
+# typed: strict
+
+module Language
+  module Perl
+    module Shebang
+      include Kernel
+    end
+  end
+end

Library/Homebrew/language/python.rb

@@ -92,16 +92,18 @@ def self.setup_install_args(prefix, python = "python3")
 
     # Mixin module for {Formula} adding shebang rewrite features.
     module Shebang
+      module_function
+
       # @private
-      def self.python_shebang_rewrite_info(python_path)
+      def python_shebang_rewrite_info(python_path)
         Utils::Shebang::RewriteInfo.new(
           %r{^#! ?/usr/bin/(?:env )?python(?:[23](?:\.\d{1,2})?)?( |$)},
           28, # the length of "#! /usr/bin/env pythonx.yyy "
           "#{python_path}\\1",
         )
       end
 
-      def self.detected_python_shebang(formula = self, use_python_from_path: false)
+      def detected_python_shebang(formula = self, use_python_from_path: false)
         python_path = if use_python_from_path
           "/usr/bin/env python3"
         else

Library/Homebrew/language/python.rbi

@@ -1,5 +1,11 @@
 # typed: strict
 
-module Language::Python::Virtualenv
-  requires_ancestor { Formula }
+module Language::Python
+  module Shebang
+    include Kernel
+  end
+
+  module Virtualenv
+    requires_ancestor { Formula }
+  end
 end