Update dependency h2 to v4.3.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
h2	==4.2.0 → ==4.3.0

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Release Notes

python-hyper/h2 (h2)

v4.3.0

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API Changes (Backward Incompatible)

• Reject header names and values containing illegal characters, based on RFC 9113, section 8.2.1.
  The main Python API is compatible, but some previously valid requests/response headers might now be blocked.
  Use the validate_inbound_headers config option if needed.
  Thanks to Sebastiano Sartor (sebsrt) for the report.
• Convert emitted events into Python dataclass, which introduces new constructors with required arguments.
  Instantiating these events without arguments, as previously commonly used API pattern, will no longer work.

API Changes (Backward Compatible)

• h2 events now have tighter type bounds, e.g. stream_id is guaranteed to not be None for most events now.
  This simplifies downstream type checking.
• Various typing-related improvements.

Bugfixes

• Fix error value when opening a new stream on too many open streams.

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