Bump vulture from 2.15 to 2.16 in /backend (#1629)

Bumps [vulture](https://github.com/jendrikseipp/vulture) from 2.15 to
2.16.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/jendrikseipp/vulture/releases">vulture's
releases</a>.</em></p>
<blockquote>
<h2>v2.16</h2>
<p>2.16 (2026-03-25)</p>
<ul>
<li>Fix false positives for dead code after while loops (<a
href="https://redirect.github.com/jendrikseipp/vulture/issues/412">#412</a>,
<a
href="https://redirect.github.com/jendrikseipp/vulture/issues/413">#413</a>,
Jendrik Seipp).</li>
<li>Use <code>ty</code> instead of <code>pytype</code> for testing type
annotations (Jendrik Seipp).</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/jendrikseipp/vulture/blob/main/CHANGELOG.md">vulture's
changelog</a>.</em></p>
<blockquote>
<h1>2.16 (2026-03-25)</h1>
<ul>
<li>Fix false positives for dead code after while loops (<a
href="https://redirect.github.com/jendrikseipp/vulture/issues/412">#412</a>,
<a
href="https://redirect.github.com/jendrikseipp/vulture/issues/413">#413</a>,
Jendrik Seipp).</li>
<li>Use <code>ty</code> instead of <code>pytype</code> for testing type
annotations (Jendrik Seipp).</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="b0f67ba004"><code>b0f67ba</code></a>
Update version number to 2.16 for release.</li>
<li><a
href="41d622413b"><code>41d6224</code></a>
Update changelog.</li>
<li><a
href="0462a5a38d"><code>0462a5a</code></a>
Don't falsely report code after while loops as dead (fixes <a
href="https://redirect.github.com/jendrikseipp/vulture/issues/412">#412</a>
and fixes <a
href="https://redirect.github.com/jendrikseipp/vulture/issues/413">#413</a>).</li>
<li><a
href="1eb212f0a0"><code>1eb212f</code></a>
Use <code>ty</code> instead of <code>pytype</code> for testing type
annotations.</li>
<li>See full diff in <a
href="https://github.com/jendrikseipp/vulture/compare/v2.15...v2.16">compare
view</a></li>
</ul>
</details>
<br />


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backend/pyproject.toml

@@ -61,7 +61,7 @@ dev = [
     "pytest-xdist==3.8.0",
     "pytest==9.0.1",
     "ruff==0.15.0",
-    "vulture==2.15",
+    "vulture==2.16",
 ]
 
 [tool.mypy]

backend/uv.lock

@@ -414,7 +414,7 @@ dev = [
     { name = "pytest-cov", specifier = "==7.1.0" },
     { name = "pytest-xdist", specifier = "==3.8.0" },
     { name = "ruff", specifier = "==0.15.0" },
-    { name = "vulture", specifier = "==2.15" },
+    { name = "vulture", specifier = "==2.16" },
 ]
 
 [[package]]
@@ -1698,11 +1698,11 @@ wheels = [
 
 [[package]]
 name = "vulture"
-version = "2.15"
+version = "2.16"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/59/c6/4f147b621b4c0899eb1770f98113334bb706ebd251ac2be979316b1985fa/vulture-2.15.tar.gz", hash = "sha256:f9d8b4ce29c69950d323f21dceab4a4d6c694403dffbed7713c4691057e561fe", size = 52438, upload-time = "2026-03-04T21:41:39.096Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/66/3e/4d08c5903b2c0c70cad583c170cc4a663fc6a61e2ad00b711fcda61358cd/vulture-2.16.tar.gz", hash = "sha256:f8d9f6e2af03011664a3c6c240c9765b3f392917d3135fddca6d6a68d359f717", size = 52680, upload-time = "2026-03-25T14:41:27.141Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/1c/f3/07cf122e145bc6df976030e9935123124c3fcb5044cf407b5e71e85821b4/vulture-2.15-py3-none-any.whl", hash = "sha256:a3d8ebef918694326620eb128fa783486c8d285b23381c2b457d864ac056ef8d", size = 26895, upload-time = "2026-03-04T21:41:39.878Z" },
+    { url = "https://files.pythonhosted.org/packages/f5/be/f935130312330614811dae2ea9df3f395f6d63889eb6c2e68c14507152ee/vulture-2.16-py3-none-any.whl", hash = "sha256:6e0f1c312cef1c87856957e5c2ca9608834a7c794c2180477f30bf0e4cc58eee", size = 26993, upload-time = "2026-03-25T14:41:26.21Z" },
 ]
 
 [[package]]