Urllib3-future

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- Fixed a rare case of HTTP/3 being disabled when forwarding a custom SSLContext created.
- Re-introduce ``DEFAULT_CIPHERS`` constant in ``urllib3.util.ssl_`` due to the demands.
It contains the Mozilla recommended cipher suite that was introduced in version 2.2.900.
- Fixed handling of OpenSSL 3.2.0 new error message for misconfiguring an HTTP proxy as HTTPS.
Ported from urllib3/3271.
- Fixed ``request_sent_latency`` that wasn't computed when request was stopped early (prior to sending the
complete body).

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- Fixed an edge case where a HTTPS record was misinterpreted when using a DNS-over-HTTPS resolver.

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- Fixed an issue where a idle QUIC connection would not be recycled properly when expired.
- Added support for passing ``-1`` as the **amt** in ``HTTPResponse`` (read, or stream) as the strict equivalent of ``read1``.
This allows you to fetch content as soon as it arrive.
- Removed orphaned method ``_handle_chunk``, ``_update_chunk_length`` from ``HTTPResponse``.
- Fixed the iterator in ``HTTPResponse`` that hung until the complete content was downloaded.

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- Fixed an issue where setting None for a header value could cause an exception.

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- Fixed compatibility with older PyPy 3.7 interpreters when HTTP/3 (qh3) can be unavailable.
- Fixed undesired DGRAM/QUIC preemptive upgrade using insecure protocol.

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- Fixed an issue where a stateless resolver (e.g. nullresolver) could not be recycled.
- Fixed an issue where one would attempt to close a resolver multiple times.