[Perl/perl5] f7f6d4: Add new contributor data to .mailmap

[James E Keenan via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: f7f6d418d6c3333d3a3f2944e72b69c0f026c33e
      
https://github.com/Perl/perl5/commit/f7f6d418d6c3333d3a3f2944e72b69c0f026c33e
  Author: James E Keenan <jkee...@cpan.org>
  Date:   2023-09-29 (Fri, 29 Sep 2023)

  Changed paths:
    M .mailmap

  Log Message:
  -----------
  Add new contributor data to .mailmap

To keep porting tests happy.