Bump icalendar from 5.0.7 to 5.0.11 (#282)

Bumps [icalendar](https://github.com/collective/icalendar) from 5.0.7 to
5.0.11.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/collective/icalendar/blob/master/CHANGES.rst">icalendar's
changelog</a>.</em></p>
<blockquote>
<h2>5.0.11 (2023-11-03)</h2>
<p>Minor changes:</p>
<ul>
<li>The cli utility now displays start and end datetimes in the user's
local timezone.
Ref: <a
href="https://redirect.github.com/collective/icalendar/issues/561">#561</a>
[vimpostor]</li>
</ul>
<p>New features:</p>
<ul>
<li>Added fuzzing harnesses, for integration to OSSFuzz.</li>
<li>icalendar releases are deployed to Github releases
Fixes: <a
href="https://redirect.github.com/collective/icalendar/issues/563">#563</a>
[jacadzaca]</li>
</ul>
<p>Bug fixes:</p>
<ul>
<li>CATEGORIES field now accepts a string as argument
Ref: <a
href="https://redirect.github.com/collective/icalendar/issues/322">#322</a>
[jacadzaca]</li>
<li>Multivalue FREEBUSY property is now parsed properly
Ref: <a
href="https://redirect.github.com/collective/icalendar/issues/27">#27</a>
[jacadzaca]</li>
<li>Compare equality and inequality of calendars more completely
Ref: <a
href="https://redirect.github.com/collective/icalendar/issues/570">#570</a></li>
<li>Use non legacy timezone name.
Ref: <a
href="https://redirect.github.com/collective/icalendar/issues/567">#567</a></li>
<li>Add some compare functions.
Ref: <a
href="https://redirect.github.com/collective/icalendar/issues/568">#568</a></li>
<li>Change OSS Fuzz build script to point to harnesses in fuzzing
directory
Ref: <a
href="https://redirect.github.com/collective/icalendar/issues/574">#574</a></li>
</ul>
<h2>5.0.10 (2023-09-26)</h2>
<p>Bug fixes:</p>
<ul>
<li>Component._encode stops ignoring parameters argument on native
values, now merges them
Fixes: <a
href="https://redirect.github.com/collective/icalendar/issues/557">#557</a>
[zocker1999net]</li>
</ul>
<h2>5.0.9 (2023-09-24)</h2>
<p>Bug fixes:</p>
<ul>
<li>PERIOD values now set the timezone of their start and end. <a
href="https://redirect.github.com/collective/icalendar/issues/556">#556</a></li>
</ul>
<p>5.0.8 (2023-09-18)</p>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/collective/icalendar/commit/2d83765c7b1dbc340392e82b1a6eda5e15c472bc"><code>2d83765</code></a>
Merge pull request <a
href="https://redirect.github.com/collective/icalendar/issues/576">#576</a>
from niccokunzmann/release</li>
<li><a
href="https://github.com/collective/icalendar/commit/23f7065b4087700cddac54abd726fa36074b139f"><code>23f7065</code></a>
version 5.0.11</li>
<li><a
href="https://github.com/collective/icalendar/commit/9ce1fa8c8f221bf58d669344d3c9f8fc8d48fad6"><code>9ce1fa8</code></a>
Merge pull request <a
href="https://redirect.github.com/collective/icalendar/issues/575">#575</a>
from niccokunzmann/comparing</li>
<li><a
href="https://github.com/collective/icalendar/commit/7f4b21331614f1b798a01b8f4ca219393918c30f"><code>7f4b213</code></a>
Test equality of vDDDLists</li>
<li><a
href="https://github.com/collective/icalendar/commit/0d94ee52f3a50befff7703cf2e95c857320f0ee1"><code>0d94ee5</code></a>
Remove Mixins and create common superclass for time properties</li>
<li><a
href="https://github.com/collective/icalendar/commit/9ba4b1155c86558ca46e7193e4e5eaed76b57b20"><code>9ba4b11</code></a>
remove unused variable</li>
<li><a
href="https://github.com/collective/icalendar/commit/7add0973bacc8f6f8a13a69d82bfbc633cd857c7"><code>7add097</code></a>
do not copy() subcomponents</li>
<li><a
href="https://github.com/collective/icalendar/commit/ec8d604095d674e47e28f0f59e09e9efaac346d7"><code>ec8d604</code></a>
document changes</li>
<li><a
href="https://github.com/collective/icalendar/commit/dc57266ca12662cad738509b070af0e8cf18532b"><code>dc57266</code></a>
Restore == and not != equivalence</li>
<li><a
href="https://github.com/collective/icalendar/commit/d95007b4943d17fd706b56ae59137fc6cf147ce6"><code>d95007b</code></a>
compare vTime and add more tests for equality</li>
<li>Additional commits viewable in <a
href="https://github.com/collective/icalendar/compare/v5.0.7...v5.0.11">compare
view</a></li>
</ul>
</details>
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requirements.txt

@@ -11,6 +11,6 @@ requests==2.31.0
 unidecode==1.3.7
 uvicorn[standard]==0.23.2
 redis==5.0.1
-icalendar == 5.0.10
+icalendar == 5.0.11
 asyncpg==0.28.0
 firebase-admin==6.2.0               # Firebase is used for push notification