Perl::Critic::Policy::InputOutput::RequireEncodingWithUTF8Layer(3pm) on Linux

The text 16a8d6a2c7a5, as Debian 13 (Trixie) shipped it.

Write "open $fh, q{<:encoding(UTF-8)}, $filename;" instead of "open $fh, q{<:utf8}, $filename;".