[Perl/perl5] dcf3fa: Syntax highlight configpm

[Elvin Aslanov via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: dcf3fa421fa60f3cfa5535313b765af4dc49ba36
      
https://github.com/Perl/perl5/commit/dcf3fa421fa60f3cfa5535313b765af4dc49ba36
  Author: Elvin Aslanov <rwp.prim...@gmail.com>
  Date:   2023-01-12 (Thu, 12 Jan 2023)

  Changed paths:
    M configpm

  Log Message:
  -----------
  Syntax highlight configpm

For enhancing the source readability in GitHub:

cf. https://raw.githubusercontent.com/Perl/perl5/blead/PACKAGING