[Perl/perl5] b5b600: Delete .travis.yml

[Elvin Aslanov via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: b5b600ed40bc317166e141c0e75be2566644dbf8
      
https://github.com/Perl/perl5/commit/b5b600ed40bc317166e141c0e75be2566644dbf8
  Author: Elvin Aslanov <rwp.prim...@gmail.com>
  Date:   2022-09-05 (Mon, 05 Sep 2022)

  Changed paths:
    R .travis.yml
    M MANIFEST

  Log Message:
  -----------
  Delete .travis.yml

This file seems no longer needed since switching to GitHub Actions for CI.