[issue3745] _sha256 et al. encode to UTF-8 by default

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

Wooops, my mouse clicked on Remove!? I removed Message73550, sorry 
gregory. Here was the content of the message:
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agreed.  most platforms should be using the openssl version, i will
update the non-openssl implementations to behave the same.

I don't think this is worth being a release blocker.  I'll do it for 
3.0.1.
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nosy: +haypo

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