[3.12] gh-73561: Omit interface scope from IPv6 when used as Host header (GH-93324) (#112272)

gh-73561: Omit interface scope from IPv6 when used as Host header (GH-93324)

Omit the `@interface_scope` from an IPv6 address when used as Host header by `http.client`.

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(cherry picked from commit ce1096f974d3158a92e050f9226700775b8db398)


 [Google LLC]

Co-authored-by: Michael <35783820+mib1185@users.noreply.github.com>