chore(deps): update dependency httpcore to v0.18.0 - autoclosed

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
httpcore	==0.17.3 → ==0.18.0

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Release Notes

encode/httpcore (httpcore)

v0.18.0

Compare Source

• Add support for HTTPS proxies. (#​745, #​786)
• Drop Python 3.7 support. (#​727)
• Handle sni_hostname extension with SOCKS proxy. (#​774)
• Handle HTTP/1.1 half-closed connections gracefully. (#​641)
• Change the type of Extensions from Mapping[Str, Any] to MutableMapping[Str, Any]. (#​762)

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