[MNT] [Dependabot](deps): Update lightning requirement from >=2.5.3 to >=2.6.1 (#545)

Updates the requirements on
[lightning](https://github.com/Lightning-AI/pytorch-lightning) to permit
the latest version.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/Lightning-AI/pytorch-lightning/commit/655a3a91828694b9bfc241177f474741e483aeaa"><code>655a3a9</code></a>
bump(deps): bump <code>litlogger</code> version to
<code>&gt;=0.1.7</code> (<a
href="https://redirect.github.com/Lightning-AI/pytorch-lightning/issues/21517">#21517</a>)</li>
<li><a
href="https://github.com/Lightning-AI/pytorch-lightning/commit/300c05a96bdb9a355e53160c695e69bb25bfa965"><code>300c05a</code></a>
Prepare release 2.6.1 (<a
href="https://redirect.github.com/Lightning-AI/pytorch-lightning/issues/21516">#21516</a>)</li>
<li><a
href="https://github.com/Lightning-AI/pytorch-lightning/commit/dc16bc56ff66ea321f90d4aec69a41c7c0bb82e4"><code>dc16bc5</code></a>
build(deps): update setuptools requirement from &lt;80.9.1 to
&lt;80.10.3 in /requi...</li>
<li><a
href="https://github.com/Lightning-AI/pytorch-lightning/commit/6ee3800a120937d27cf774e57d2d28986062999e"><code>6ee3800</code></a>
build(deps): update torchvision requirement from &lt;0.25.0,&gt;=0.16.0
to &gt;=0.16.0...</li>
<li><a
href="https://github.com/Lightning-AI/pytorch-lightning/commit/6478f8ec9cd3d4f524d73ad0df070d0a566ee9a3"><code>6478f8e</code></a>
Fix <code>save_hyperparameters</code> ignore precedence in subclasses
(<a
href="https://redirect.github.com/Lightning-AI/pytorch-lightning/issues/21490">#21490</a>)</li>
<li><a
href="https://github.com/Lightning-AI/pytorch-lightning/commit/2712587858c8f89e9dfbfe10cb919340acdb9c8c"><code>2712587</code></a>
CI: fix doctest failure from PyTorch LeafSpec FutureWarning (<a
href="https://redirect.github.com/Lightning-AI/pytorch-lightning/issues/21502">#21502</a>)</li>
<li><a
href="https://github.com/Lightning-AI/pytorch-lightning/commit/ae1dc6f0eb9ce3229532b4de7f1036630ae7e2f1"><code>ae1dc6f</code></a>
fix(link-check): resolve broken URLs (<a
href="https://redirect.github.com/Lightning-AI/pytorch-lightning/issues/21493">#21493</a>)</li>
<li><a
href="https://github.com/Lightning-AI/pytorch-lightning/commit/f0b1c5274552b607d7a4b22216deaf910ffc2aba"><code>f0b1c52</code></a>
fix(fabric): forward set_epoch to underlying sampler in
DistributedSamplerWra...</li>
<li><a
href="https://github.com/Lightning-AI/pytorch-lightning/commit/bddc25309b77a5100c86105354108ec3abe89711"><code>bddc253</code></a>
Fix warning frequency in throughput monitor callback (<a
href="https://redirect.github.com/Lightning-AI/pytorch-lightning/issues/21453">#21453</a>)</li>
<li><a
href="https://github.com/Lightning-AI/pytorch-lightning/commit/2f4b58a84aca372b92091fb8463a3f76d741b825"><code>2f4b58a</code></a>
build(deps): update numpy requirement from &lt;2.3.5,&gt;2.1.0 to
&gt;2.1.0,&lt;2.4.2 in ...</li>
<li>Additional commits viewable in <a
href="https://github.com/Lightning-AI/pytorch-lightning/compare/2.5.3...2.6.1">compare
view</a></li>
</ul>
</details>
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pyproject.toml

@@ -15,7 +15,7 @@ authors = [
 dependencies = [
     "biopython>=1.83",
     "datasets>=4.0.0",
-    "lightning>=2.5.3",
+    "lightning>=2.6.1",
     "numpy>=2.0.2",
     "pandas>=2.0.0",
     "scikit-base",