[Perl/perl5] b15d21: Added release managers through January 2023

[Neil Bowers via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: b15d219e387df23e2b242fa9e723118f75833905
      
https://github.com/Perl/perl5/commit/b15d219e387df23e2b242fa9e723118f75833905
  Author: Neil Bowers <ne...@neilb.org>
  Date:   2022-06-14 (Tue, 14 Jun 2022)

  Changed paths:
    M Porting/release_schedule.pod

  Log Message:
  -----------
  Added release managers through January 2023