Bump lightning from 2.5.0 to 2.6.6 (#294)

Bumps [lightning](https://github.com/Lightning-AI/pytorch-lightning) from 2.5.0 to 2.6.6.
- [Release notes](https://github.com/Lightning-AI/pytorch-lightning/releases)
- [Commits](Lightning-AI/pytorch-lightning@2.5.0...2.6.6)

---
updated-dependencies:
- dependency-name: lightning
  dependency-version: 2.6.6
  dependency-type: direct:production
...

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Author: dependabot[bot]

pyproject.toml

@@ -30,7 +30,7 @@ dependencies = [
     "torchvision",
     "pycocotools",
     "filterpy",
-    "lightning==2.5.0", # see https://github.com/Lightning-AI/pytorch-lightning/pull/20669
+    "lightning==2.6.6", # see https://github.com/Lightning-AI/pytorch-lightning/pull/20669
     "mlflow",
     "optuna",
     "numpy>=2.0.0",