Update dependency httpcore to v0.18.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
httpcore	==0.16.3 -> ==0.18.0

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Release Notes

encode/httpcore (httpcore)

v0.18.0

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• 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)

v0.17.3

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• Support async cancellations, ensuring that the connection pool is left in a clean state when cancellations occur. (#​726)
• The networking backend interface has been added to the public API. Some classes which were previously private implementation detail are now part of the top-level public API. (#​699)
• Graceful handling of HTTP/2 GoAway frames, with requests being transparently retried on a new connection. (#​730)
• Add exceptions when a synchronous trace callback is passed to an asynchronous request or an asynchronous trace callback is passed to a synchronous request. (#​717)
• Drop Python 3.7 support. (#​727)

v0.17.2

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• Add socket_options argument to ConnectionPool and HTTProxy classes. (#​668)
• Improve logging with per-module logger names. (#​690)
• Add sni_hostname request extension. (#​696)
• Resolve race condition during import of anyio package. (#​692)
• Enable TCP_NODELAY for all synchronous sockets. (#​651)

v0.17.1

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• If 'retries' is set, then allow retries if an SSL handshake error occurs. (#​669)
• Improve correctness of tracebacks on network exceptions, by raising properly chained exceptions. (#​678)
• Prevent connection-hanging behaviour when HTTP/2 connections are closed by a server-sent 'GoAway' frame. (#​679)
• Fix edge-case exception when removing requests from the connection pool. (#​680)
• Fix pool timeout edge-case. (#​688)

v0.17.0

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• Add DEBUG level logging. (#​648)
• Respect HTTP/2 max concurrent streams when settings updates are sent by server. (#​652)
• Increase the allowable HTTP header size to 100kB. (#​647)
• Add retries option to SOCKS proxy classes. (#​643)

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