[PATCH 1 of 2] py3: fix for Python 3.12 emitting SyntaxWarning on invalid escape sequences

[Raphaël Gomès]

Patch 1 was taken and will land in 6.4, patch 2 doesn't pass CI and is 
just a quality of life improvement for devs, so that'll have to wait for 
later.

I'll still get to answering your email about the review process next 
week, I've been too busy so far.

Raphaël

On 3/21/23 17:51, Mads Kiilerich wrote:
> Thanks for landing the previous 3.12 fixes. But I missed one fix ...
>
> The remaining test failures on 3.12 are mostly from the removal 
> (asyncore, smtpd and distutils) and deprecation (cgitb) in standard 
> library.
>
> /Mads
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