POD: fix the handling of UTF-8 encoded documents

[xenu]

Pod::Simple outputs characters, not bytes, so STDOUT needs an encoding layer.

Example Pod document where UTF-8 wasn't rendered properly:

https://github.com/Perl/perl5/blob/23e1e448eede42df229448fd610799a7a0831254/Porting/release_schedule.pod

[github-actions[bot]]

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[xenu]

OK, so because of this wonderful bot, which BTW is misconfigured and doesn't even post a proper message, now I'm supposed to periodically "bump" my PR.

Which accomplishes exactly nothing apart from creating busywork and annoying people.

[xenu]

P.S.:

• "GitHub stale bot considered harmful"
• "No More Stale Bots!"
• "Github Stale Bots: A False Economy"

[github-actions[bot]]

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