Update Rust crate h2 to v0.4.16

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
h2	dependencies	patch	0.4.15 → 0.4.16

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Release Notes

hyperium/h2 (h2)

v0.4.16

Compare Source

• Fix limiting excessive amount of small DATA frames.
• Fix double counting pushed streams when receiving 1xx responses.
• Fix releasing of flow control capacity earlier, when RecvStream is dropped.
• Fix missed wakeup in poll_trailers.
• Fix extra memory retained when copying HeaderValues.
• Fix resets received after END_OF_STREAM to allow the data to still be received.
• Fix busy-looping when IO write returns 0 to mean connection closed.
• Optimize HPACK decoding tables from 4-bit states to 1-byte states.
• Optimize IO writing contention by not holding lock while flushing.

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