Bump tornado from 6.5.5 to 6.5.6 in /libs/weaviate in the pip group across 1 directory (#274)

Bumps the pip group with 1 update in the /libs/weaviate directory:
[tornado](https://github.com/tornadoweb/tornado).

Updates `tornado` from 6.5.5 to 6.5.6
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/tornadoweb/tornado/blob/master/docs/releases.rst">tornado's
changelog</a>.</em></p>
<blockquote>
<h1>Release notes</h1>
<p>.. toctree::
:maxdepth: 2</p>
<p>releases/v6.5.7
releases/v6.5.6
releases/v6.5.5
releases/v6.5.4
releases/v6.5.3
releases/v6.5.2
releases/v6.5.1
releases/v6.5.0
releases/v6.4.2
releases/v6.4.1
releases/v6.4.0
releases/v6.3.3
releases/v6.3.2
releases/v6.3.1
releases/v6.3.0
releases/v6.2.0
releases/v6.1.0
releases/v6.0.4
releases/v6.0.3
releases/v6.0.2
releases/v6.0.1
releases/v6.0.0
releases/v5.1.1
releases/v5.1.0
releases/v5.0.2
releases/v5.0.1
releases/v5.0.0
releases/v4.5.3
releases/v4.5.2
releases/v4.5.1
releases/v4.5.0
releases/v4.4.3
releases/v4.4.2
releases/v4.4.1
releases/v4.4.0
releases/v4.3.0
releases/v4.2.1
releases/v4.2.0
releases/v4.1.0
releases/v4.0.2
releases/v4.0.1
releases/v4.0.0
releases/v3.2.2
releases/v3.2.1</p>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/tornadoweb/tornado/commit/aba2569f7ed7a6bdbef816658fb6b7182531b751"><code>aba2569</code></a>
Merge pull request <a
href="https://redirect.github.com/tornadoweb/tornado/issues/3626">#3626</a>
from bdarnell/fixes-656</li>
<li><a
href="https://github.com/tornadoweb/tornado/commit/a24b260e0d22fd48acea1a2635526c1700e7ac09"><code>a24b260</code></a>
httpclient_test: Accept an additional error message variant</li>
<li><a
href="https://github.com/tornadoweb/tornado/commit/a74240a70268fe5cb40a127951cb21549ab9ff24"><code>a74240a</code></a>
Release notes and version bump for 6.5.6.</li>
<li><a
href="https://github.com/tornadoweb/tornado/commit/e8fc7edb238f1022e39f9d0b9d297fc7c21fb0a5"><code>e8fc7ed</code></a>
simple_httpclient: Strip auth headers on cross-origin redirects</li>
<li><a
href="https://github.com/tornadoweb/tornado/commit/96dc88c2a05705287856b2cd6b4b4034f9a6aaac"><code>96dc88c</code></a>
speedups: validate mask length</li>
<li><a
href="https://github.com/tornadoweb/tornado/commit/ff808b33adc52d89a549376a5e3628e92abbc8ff"><code>ff808b3</code></a>
http1connection: Enforce max_body_size in _GzipMessageDelegate</li>
<li><a
href="https://github.com/tornadoweb/tornado/commit/ede4e37f93c1edbc0bf749e9a57c9db2501cd54b"><code>ede4e37</code></a>
auth: Correctly parse check_authentication response</li>
<li><a
href="https://github.com/tornadoweb/tornado/commit/1c178bef88bbd29907eb94a2a649a4a6675681de"><code>1c178be</code></a>
Remove obsolete curl force_timeout workaround</li>
<li><a
href="https://github.com/tornadoweb/tornado/commit/c99d55bb6cc0c9da2c6696545ed4ee1d20b7fcf0"><code>c99d55b</code></a>
Replace deprecated pycurl IOCTLFUNCTION callback with SEEKFUNCTION</li>
<li><a
href="https://github.com/tornadoweb/tornado/commit/27614316ef8ad125fe18725cf96e384560ba0e14"><code>2761431</code></a>
Merge pull request <a
href="https://redirect.github.com/tornadoweb/tornado/issues/3587">#3587</a>
from bdarnell/fix-link</li>
<li>Additional commits viewable in <a
href="https://github.com/tornadoweb/tornado/compare/v6.5.5...v6.5.6">compare
view</a></li>
</ul>
</details>
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