Update to 3.008

Upstream changes:
version 3.008: Wed  9 Aug 10:03:40 CEST 2023

        Fixes:
        - do not confuse multiple connections with own imap_client object
          rt.cpan.org#1036931 [Jonathan Kamens]
        - test fails for Mail::Message 3.013, which detects charset better

        Improvements:
        - github merge#1 fix example [Randolf Richardson]
        - run test in write only environment, github#2 [Petr Pisar]

(wen)