[3.11] gh-103204: `http.server` - Enforce that HTTP version numbers must consist...

[3.11] gh-103204: `http.server` - Enforce that HTTP version numbers must consist only of digits (GH-103205) (#104438)

gh-103204: `http.server` - Enforce that HTTP version numbers must consist only of digits (GH-103205)

Reject HTTP requests with invalid http/x.y version numbers: x or y being non-digits or too-long.

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(cherry picked from commit cf720acfcbd8c9c25a706a4b6df136465a803992)

Co-authored-by: Ben Kallus <49924171+kenballus@users.noreply.github.com>
Co-authored-by: Oleg Iarygin <oleg@arhadthedev.net>
Co-authored-by: Gregory P. Smith <greg@krypto.org>