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chore: bump h2 from 4.3.0 to 4.4.1 in /libs/langchain_v1 (#39324)
Bumps [h2](https://github.com/python-hyper/h2) from 4.3.0 to 4.4.1.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/python-hyper/h2/blob/master/CHANGELOG.rst">h2's
changelog</a>.</em></p>
<blockquote>
<h2>4.4.1 (2026-08-03)</h2>
<p><strong>Bugfixes</strong></p>
<ul>
<li>Performance improvement: remove consumed frames in-place from data
buffer.</li>
<li>Reject duplicate Host headers in request headers. Thanks to Sunand
Mohan for the report.</li>
</ul>
<h2>4.4.0 (2026-07-23)</h2>
<p><strong>API Changes (Backward Incompatible)</strong></p>
<ul>
<li>Support for Python 3.9 has been removed.</li>
<li>Support for PyPy 3.9 has been removed.</li>
<li><code>Stream.end_stream()</code> now raises
<code>NoSuchStreamError</code> or <code>StreamClosedError</code>
exceptions, instead of a generic <code>KeyError</code>.</li>
<li>Duplicate <code>content-length</code> headers with different values
now raise <code>ProtocolError</code>.
Previously, the first <code>content-length</code> header was accepted
and later conflicting values were ignored. Thanks to Harshal Parekh for
the report.</li>
<li>Parse <code>content-length</code> headers according to RFC9110
grammar for numbers (1*DIGIT). Thanks to Arkadiusz Marta for the
report.</li>
<li><strong>backfill from v4.3.0</strong> Convert emitted events into
Python <code>dataclass</code>, which introduces new constructors with
required arguments.
Instantiating these events without arguments, as previously commonly
used API pattern, will no longer work.</li>
</ul>
<p><strong>API Changes (Backward Compatible)</strong></p>
<ul>
<li>Support for Python 3.14 has been added.</li>
<li><code>H2Connection.receive_data</code> now accepts any byte-like
object that
implements the buffer protocol, such as <code>bytes</code>,
<code>bytearray</code>, and
<code>memoryview</code>. Existing <code>bytes</code> callers are
unaffected.</li>
<li>Align CONNECT pseudo-header validation with RFC 9113 s8.3 and RFC
8441 s4.
Ordinary CONNECT now requires <code>:method=CONNECT</code> and
<code>:authority</code>, and
forbids <code>:scheme</code>/<code>:path</code>. Extended CONNECT (e.g.,
WebSocket) requires
<code>:scheme</code>, <code>:path</code>, <code>:authority</code> plus
<code>:protocol</code>. (PR <a
href="https://redirect.github.com/python-hyper/h2/issues/1309">#1309</a>)</li>
<li>Fix incorrect substring matching of secure header in
<code>cookie</code> and <code>:method</code>.</li>
</ul>
<p><strong>Bugfixes</strong></p>
<ul>
<li>Fix to allow sending 0 bytes on a stream even if the flow control
window is negative.</li>
<li>Reject non-zero <code>SETTINGS_ENABLE_PUSH</code> values received
from servers.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/python-hyper/h2/commit/bc239af1d1b85bc70482804f30a0e0e587d90a08"><code>bc239af</code></a>
v4.4.1</li>
<li><a
href="https://github.com/python-hyper/h2/commit/92b925ed1b1817c82db32893503f74f47fcf4452"><code>92b925e</code></a>
add test for duplicate host headers</li>
<li><a
href="https://github.com/python-hyper/h2/commit/292a40829feefda98c8509dcdbbb4a57af9bd6a6"><code>292a408</code></a>
reject duplicate Host headers in request headers</li>
<li><a
href="https://github.com/python-hyper/h2/commit/04d3b87cbc1db020d28c7cfb44fe194558efbdde"><code>04d3b87</code></a>
update changelog</li>
<li><a
href="https://github.com/python-hyper/h2/commit/439b970d0fa19891fa81068907de97dfa3a07c3a"><code>439b970</code></a>
prepare for next release cycle</li>
<li><a
href="https://github.com/python-hyper/h2/commit/9a7ff7430df669fa8e90b6121f3cc1ed64d1115a"><code>9a7ff74</code></a>
performance: remove consumed frames in place from data buffer (<a
href="https://redirect.github.com/python-hyper/h2/issues/1321">#1321</a>)</li>
<li><a
href="https://github.com/python-hyper/h2/commit/6cce763997eca5b826f3e435a611b7a7fc73f633"><code>6cce763</code></a>
v4.4.0</li>
<li><a
href="https://github.com/python-hyper/h2/commit/dfafda3b0cd96455b45d1785ef1ebc6968bba5cf"><code>dfafda3</code></a>
Bump pytest from 8.4.2 to 9.0.3 (<a
href="https://redirect.github.com/python-hyper/h2/issues/1320">#1320</a>)</li>
<li><a
href="https://github.com/python-hyper/h2/commit/b45207cedf9fabe2c77bb3c1c10f403a610599a0"><code>b45207c</code></a>
dependencies and packaging++</li>
<li><a
href="https://github.com/python-hyper/h2/commit/c40145f69c5473850849fe96301ac0416b1afea6"><code>c40145f</code></a>
parse <code>content-length</code> headers according to RFC9110 grammar
for numbers (1*DI...</li>
<li>Additional commits viewable in <a
href="https://github.com/python-hyper/h2/compare/v4.3.0...v4.4.1">compare
view</a></li>
</ul>
</details>
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