[Perl/perl5] c54274: remove extra entry for mauke in AUTHORS

[Graham Knop via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: c542745d8baa83293633ab4377da15b720141eb0
      
https://github.com/Perl/perl5/commit/c542745d8baa83293633ab4377da15b720141eb0
  Author: Graham Knop <ha...@haarg.org>
  Date:   2023-09-06 (Wed, 06 Sep 2023)

  Changed paths:
    M AUTHORS

  Log Message:
  -----------
  remove extra entry for mauke in AUTHORS

It's no longer needed, as a correct .mailmap entry was added.