Remove atomic_write workaround.

Library/Homebrew/extend/pathname.rb

@@ -162,18 +162,8 @@ class Pathname
 
   # NOTE: This always overwrites.
   def atomic_write(content)
-    # The enclosing `mktmpdir` and the `chmod` are a workaround
-    # for https://github.com/rails/rails/pull/34037.
-    Dir.mktmpdir(".d", dirname) do |tmpdir|
-      should_fix_sticky_bit = dirname.world_writable? && !dirname.sticky?
-      FileUtils.chmod "+t", dirname if should_fix_sticky_bit
-      begin
-        File.atomic_write(self, tmpdir) do |file|
-          file.write(content)
-        end
-      ensure
-        FileUtils.chmod "-t", dirname if should_fix_sticky_bit
-      end
+    File.atomic_write(self) do |file|
+      file.write(content)
     end
   end