Bump django from 5.1.4 to 5.1.5 in /api (#351)

Bumps [django](https://github.com/django/django) from 5.1.4 to 5.1.5.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/django/django/commit/3d3d7f5052edb99bafaa5a2f1a7dd5b968643727"><code>3d3d7f5</code></a>
[5.1.x] Bumped version for 5.1.5 release.</li>
<li><a
href="https://github.com/django/django/commit/4806731e58f3e8700a3c802e77899d54ac6021fe"><code>4806731</code></a>
[5.1.x] Fixed CVE-2024-56374 -- Mitigated potential DoS in IPv6
validation.</li>
<li><a
href="https://github.com/django/django/commit/d6749de9278c5417944a0d8e22967b4986906b1c"><code>d6749de</code></a>
[5.1.x] Made cosmetic edits to 5.1.5 release notes.</li>
<li><a
href="https://github.com/django/django/commit/b325864686f1c1ffbe7062618e9cdfe0b5c45a35"><code>b325864</code></a>
[5.1.x] Fixed <a
href="https://redirect.github.com/django/django/issues/36077">#36077</a>
-- Corrected docs on pk value where Model.save() execute...</li>
<li><a
href="https://github.com/django/django/commit/8d81c4730f476e8f492be7814532af21ad0f097c"><code>8d81c47</code></a>
[5.1.x] Fixed <a
href="https://redirect.github.com/django/django/issues/35999">#35999</a>
-- Removed #django IRC channel references where appropri...</li>
<li><a
href="https://github.com/django/django/commit/6b9d5ac69c3cee0d3cc5997fcdc146e822173ab0"><code>6b9d5ac</code></a>
[5.1.x] Strengthened wording on supported Python versions in FAQ.</li>
<li><a
href="https://github.com/django/django/commit/0966cc73646df333db7fe000cda07d127c56ed0b"><code>0966cc7</code></a>
[5.1.x] Added stub release notes and release date for 5.1.5, 5.0.11, and
4.2.18.</li>
<li><a
href="https://github.com/django/django/commit/638547bc0b3487d979b1c3968ea13227161214cf"><code>638547b</code></a>
[5.1.x] Fixed typo in tutorial 5.</li>
<li><a
href="https://github.com/django/django/commit/2ee6ca6d35f667c54cba7efacccee3b9f178a6e7"><code>2ee6ca6</code></a>
[5.1.x] Fixed <a
href="https://redirect.github.com/django/django/issues/34856">#34856</a>
-- Fixed references to index_together in historical migr...</li>
<li><a
href="https://github.com/django/django/commit/85c3550106b6a5b2d08e09f338553df0dfe54e4a"><code>85c3550</code></a>
[5.1.x] Refs <a
href="https://redirect.github.com/django/django/issues/27236">#27236</a>
-- Removed references to index_together from ModelState.f...</li>
<li>Additional commits viewable in <a
href="https://github.com/django/django/compare/5.1.4...5.1.5">compare
view</a></li>
</ul>
</details>
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api/requirements.txt

@@ -5,7 +5,7 @@ certifi==2024.12.14
 cffi==1.17.1
 charset-normalizer==3.4.1
 cryptography==44.0.0
-Django==5.1.4
+Django==5.1.5
 django-flexi-settings @ git+https://github.com/cedadev/django-flexi-settings.git@68eb74b00e28448279e7d800889d6e39466bf0ce
 django-settings-object @ git+https://github.com/cedadev/django-settings-object.git@2b66c0fc5eae92972df5210b4bc43f7d95ad9ceb
 djangorestframework==3.15.2