v1.27.1

Changes with freenginx 1.27.1 04 Jun 2024

*) Feature: the "max_headers" directive.
   Thanks to Maksim Yevmenkin.

*) Feature: the $upstream_cache_key variable.
   Thanks to Kirill A. Korinsky.

*) Feature: XOAUTH2 and OAUTHBEARER authentication mechanisms support in
   the mail proxy module.
   Thanks to Rob Mueller.

*) Bugfix: graceful shutdown of old worker processes might be delayed
   when using HTTP/2.
   Thanks to Kasei Wang.

*) Bugfix: a segmentation fault might occur in a worker process when
   using HTTP/3.

*) Bugfix: in HTTP/3.

*) Bugfix: in the mail proxy module.

Full Changelog: 1.27.0...1.27.1