chore: bump hashlib-additional from 1.0.0 to 1.1 (#182)

Bumps
[hashlib-additional](https://github.com/rfinnie/python-hashlib-additional)
from 1.0.0 to 1.1.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/rfinnie/python-hashlib-additional/releases">hashlib-additional's
releases</a>.</em></p>
<blockquote>
<h2>hashlib-additional 1.1</h2>
<ul>
<li>Fix setup.py encoding issue on Windows</li>
<li>Add new checksums: cksum, sysv, fletcher16, fletcher32,
fletcher64</li>
<li>Additional build/CI/test improvements</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="42c209ed4b"><code>42c209e</code></a>
hashlib-additional 1.1</li>
<li><a
href="02f80b372e"><code>02f80b3</code></a>
Small fix, if -&gt; elif</li>
<li><a
href="1ea6ae2d8f"><code>1ea6ae2</code></a>
Add Fletcher checksums</li>
<li><a
href="f38943cb7e"><code>f38943c</code></a>
Test Python 3.9</li>
<li><a
href="96a7e305d9"><code>96a7e30</code></a>
Enforce coverage</li>
<li><a
href="9682c93ccf"><code>9682c93</code></a>
Remove unneeded flake8 C901 ignore</li>
<li><a
href="baf2a07ddf"><code>baf2a07</code></a>
setup.py: force UTF-8 README for Windows</li>
<li><a
href="189ef49eb2"><code>189ef49</code></a>
100% code coverage</li>
<li><a
href="005805d2bc"><code>005805d</code></a>
Implement tox, CI</li>
<li><a
href="26523727ca"><code>2652372</code></a>
Doc updates</li>
<li>Additional commits viewable in <a
href="https://github.com/rfinnie/python-hashlib-additional/compare/v1.0...v1.1">compare
view</a></li>
</ul>
</details>
<br />


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</details>

backend/requirements.txt

@@ -45,7 +45,7 @@ aiohttp==3.13.3
 # Crypto/Blockchain
 cryptography==41.0.7
 ecdsa==0.18.0
-hashlib-additional==1.0.0
+hashlib-additional==1.1
 
 # Testing
 pytest==7.4.3