[perl5-dbi/dbi] 4a68c5: Bump VERSION to 1.643

[Tim Bunce]

  Branch: refs/heads/master
  Home:   https://github.com/perl5-dbi/dbi
  Commit: 4a68c5a79ab859b6308dd742ac2d2416e3d0dd92
      
https://github.com/perl5-dbi/dbi/commit/4a68c5a79ab859b6308dd742ac2d2416e3d0dd92
  Author: Tim Bunce <tim.bu...@pobox.com>
  Date:   2020-01-31 (Fri, 31 Jan 2020)

  Changed paths:
    M DBI.pm

  Log Message:
  -----------
  Bump VERSION to 1.643