Deprecated code warning

[coke]

Reinstalling after updating to 2026.04:

[Cro::Core] Saw 1 occurrence of deprecated code.
[Cro::Core] ================================================================================
[Cro::Core] Method perl (from Mu) seen at:
[Cro::Core]   t/tcp.rakutest, lines 108,218
[Cro::Core] Please use raku instead.
[Cro::Core] --------------------------------------------------------------------------------
[Cro::Core] Please contact the author to have these occurrences of deprecated code
[Cro::Core] adapted, so that this message will disappear!