Log Message:
Update to 6.93

Upstream changes:
6.93  Tue Jun 15 19:28:17 BST 2021
    - Update online test to use Libera.chat

6.92  Tue Jun 8 14:31:39 BST 2021
    - v5.8.9 didn't have '>' pack() modifier, switch to use 'N'

6.91  Sat Jun 5 13:54:11 BST 2021
    - Don't queue messages if $self->{flood}
    - Fix issue with DCC on OpenBSD with newer Socket >= 2.031