Wide character in print

[theory]

The Sqitch spelling test emits warnings for multibyte characters, like this:

❯ prove -lr ./xt/release/pod-spelling.t
./xt/release/pod-spelling.t .. 1/109 Wide character in print at /Users/david/.plenv/versions/5.36.0/lib/perl5/site_perl/5.36.0/Pod/Spell.pm line 148.
./xt/release/pod-spelling.t .. 52/109 Wide character in print at /Users/david/.plenv/versions/5.36.0/lib/perl5/site_perl/5.36.0/Pod/Spell.pm line 148.
Wide character in print at /Users/david/.plenv/versions/5.36.0/lib/perl5/site_perl/5.36.0/Pod/Spell.pm line 148.
./xt/release/pod-spelling.t .. ok       
All tests successful.
Files=1, Tests=109,  1 wallclock secs ( 0.01 usr  0.00 sys +  1.07 cusr  0.35 csys =  1.43 CPU)
Result: PASS

Unlike the first attempt attempt to fix the issue in #10, these aren't failure, just warnings. I tried to make them go away by adding

use open ':std', ':encoding(UTF-8)';

To the test script, but the warnings persisted. Any other suggestions? Seems weird that the open pragma isn't changing the behavior of the open call here.