java: fix java_home on macOS

Library/Homebrew/extend/os/language/java.rb

@@ -0,0 +1,4 @@
+# typed: strict
+# frozen_string_literal: true
+
+require "extend/os/mac/language/java" if OS.mac?

Library/Homebrew/extend/os/mac/language/java.rb

@@ -0,0 +1,10 @@
+# typed: true
+# frozen_string_literal: true
+
+module Language
+  module Java
+    def self.java_home(version = nil)
+      find_openjdk_formula(version)&.opt_libexec&.join("openjdk.jdk/Contents/Home")
+    end
+  end
+end

Library/Homebrew/language/java.rb

@@ -45,3 +45,5 @@ module Language
     end
   end
 end
+
+require "extend/os/language/java"