[Perl/perl5] b86bc1: README: update bad version bumping for 5.38.0

[Ricardo Signes via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: b86bc1b780f65142dc22b1cb46dfe087d46fd05c
      
https://github.com/Perl/perl5/commit/b86bc1b780f65142dc22b1cb46dfe087d46fd05c
  Author: Ricardo Signes <rjbs@semiotic.systems>
  Date:   2023-06-29 (Thu, 29 Jun 2023)

  Changed paths:
    M README.haiku
    M README.macosx

  Log Message:
  -----------
  README: update bad version bumping for 5.38.0