[Perl/perl5] d49d6d: squashme: rename stub new to open

[Hugo van der Sanden via perl5-changes]

  Branch: refs/heads/hv/warndoc
  Home:   https://github.com/Perl/perl5
  Commit: d49d6d971a6ee5624c6e29aa730a9da28a54cc48
      
https://github.com/Perl/perl5/commit/d49d6d971a6ee5624c6e29aa730a9da28a54cc48
  Author: Hugo van der Sanden <h...@crypt.org>
  Date:   2023-06-08 (Thu, 08 Jun 2023)

  Changed paths:
    M lib/warnings.pm
    M regen/warnings.pl

  Log Message:
  -----------
  squashme: rename stub new to open

Keep things consistent.