Update CPAN-Meta-Requirements to CPAN version 2.123

  [DELTA]

2.123     2013-08-30 12:17:14 America/New_York

    [Fixed]

    - On Perls prior to v5.12, CPAN::Meta::Requirements will be installed
      into the 'core' library path to avoid an older version bundled with
      ExtUtils::MakeMaker and installed there taking precedence.