Bump h2 from 3.0.1 to 4.1.0 in /backend

[dependabot]

Bumps h2 from 3.0.1 to 4.1.0.

Changelog

Sourced from h2's changelog.

4.1.0 (2021-10-05)

Note: The GitHub repository has been renamed to python-hyper/h2, previously was python-hyper/hyper-h2. The name of the package on PyPI is unchanged!

API Changes (Backward-Compatible)

- Support for Python 3.9 has been added.
- Support for Python 3.10 has been added.
- New example for a Python socket HTTP/2 client.
- New `OutputLogger` for use with ``h2.config.logger``. This is only provided
  for convenience and not part of the stable API.
Bugfixes

- Header validation now rejects empty header names with a ProtocolError. While
  hpack decodes such header blocks without issues, they violate the
  HTTP semantics.
- Fix TE header name in error message.
4.0.0 (2020-09-19)
API Changes (Backward-Incompatible)

</code></pre>

<ul>

<li>Support for Python 2.7 has been removed.</li>

<li>Support for Python 3.4 has been removed.</li>

<li>Support for Python 3.5 has been removed.</li>

<li>Support for PyPy (Python 2.7 compatible) has been removed.</li>

<li>Support for Python 3.8 has been added.</li>

<li>Receiving DATA before HEADERS now raises a ProtocolError (see <a href="https://tools.ietf.org/html/rfc7540#section-8.1&quot;&gt;https://tools.ietf.org/html/rfc7540#section-8.1&lt;/a&gt;)&lt;/li>

</ul>

<h2>3.2.0 (2020-02-08)</h2>

<p>Bugfixes</p>

<pre><code>

Receiving DATA frames on closed (or reset) streams now properly emit a

WINDOW_UPDATE to keep the connection flow window topped up.

API Changes (Backward-Incompatible)

</code></pre>

<ul>

<li><code>h2.config.logger</code> now uses a <code>trace(...)</code> function, in addition</li>

</ul>

<!-- raw HTML omitted -->

</blockquote>

<p>... (truncated)</p>

</details>

<details>

<summary>Commits</summary>
<ul>

<li><a href="https://github.com/python-hyper/h2/commit/799b1eab3958aa3fcbab8f5eca39e8d17f7c1cf9&quot;&gt;&lt;code&gt;799b1ea&lt;/code&gt;&lt;/a> v4.1.0</li>

<li><a href="https://github.com/python-hyper/h2/commit/54d8eb1050b4b682cfed6b727a8b0ff64ec5da06&quot;&gt;&lt;code&gt;54d8eb1&lt;/code&gt;&lt;/a> Merge pull request <a href="https://redirect.github.com/python-hyper/h2/issues/1264&quot;&gt;#1264&lt;/a> from python-hyper/py310</li>

<li><a href="https://github.com/python-hyper/h2/commit/2c3a33a9513e474ecfc70e97e8142521e21e5bb5&quot;&gt;&lt;code&gt;2c3a33a&lt;/code&gt;&lt;/a> support Python 3.10</li>

<li><a href="https://github.com/python-hyper/h2/commit/a8fe33bb2a9a6ffe027c6d4ccea8cad7d5856be0&quot;&gt;&lt;code&gt;a8fe33b&lt;/code&gt;&lt;/a> Merge pull request <a href="https://redirect.github.com/python-hyper/h2/issues/1262&quot;&gt;#1262&lt;/a> from mhils/fix-header-name</li>

<li><a href="https://github.com/python-hyper/h2/commit/16ecfbfa62192866379d7d5fd477652df5ee0469&quot;&gt;&lt;code&gt;16ecfbf&lt;/code&gt;&lt;/a> fix te header name in error message</li>

<li><a href="https://github.com/python-hyper/h2/commit/b7dd09c7b05141261e0e5cee0e5fa633ce805139&quot;&gt;&lt;code&gt;b7dd09c&lt;/code&gt;&lt;/a> Merge pull request <a href="https://redirect.github.com/python-hyper/h2/issues/1261&quot;&gt;#1261&lt;/a> from Kriechi/simple-example</li>

<li><a href="https://github.com/python-hyper/h2/commit/ee057ba6bd9d52df1f4d089c212cc58cb679714f&quot;&gt;&lt;code&gt;ee057ba&lt;/code&gt;&lt;/a> add plain sockets example client</li>

<li><a href="https://github.com/python-hyper/h2/commit/48bfc0014da06f67a9bca4382d56401daf63c835&quot;&gt;&lt;code&gt;48bfc00&lt;/code&gt;&lt;/a> Merge pull request <a href="https://redirect.github.com/python-hyper/h2/issues/1259&quot;&gt;#1259&lt;/a> from Kriechi/reject-empty-header-names</li>

<li><a href="https://github.com/python-hyper/h2/commit/1140e3b9cd70fbfdbae013589c85993105bbc78b&quot;&gt;&lt;code&gt;1140e3b&lt;/code&gt;&lt;/a> reject empty header names</li>

<li><a href="https://github.com/python-hyper/h2/commit/13589e3c03640ce462dea28b7176aab7b80572d4&quot;&gt;&lt;code&gt;13589e3&lt;/code&gt;&lt;/a> add logger test</li>

<li>Additional commits viewable in <a href="https://github.com/python-hyper/h2/compare/v3.0.1...v4.1.0&quot;&gt;compare view</a></li>

</ul>

</details>
<br />



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