Update pytorch-lightning requirement

Updates the requirements on [pytorch-lightning](https://github.com/Lightning-AI/lightning) to permit the latest version.
- [Release notes](https://github.com/Lightning-AI/lightning/releases)
- [Commits](Lightning-AI/pytorch-lightning@2.0.0...2.5.5)

---
updated-dependencies:
- dependency-name: pytorch-lightning
  dependency-version: 2.5.5
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements/base.txt

@@ -2,7 +2,7 @@ torch >=1.11.0
 numpy >1.20.0, <2.0
 pandas >=1.1.5
 scikit-learn >=1.3.0
-pytorch-lightning >=2.0.0, <2.5.0
+pytorch-lightning >=2.0.0, <2.6.0
 omegaconf >=2.3.0
 torchmetrics >=0.10.0, <1.7.0
 tensorboard >2.2.0, !=2.5.0