build(deps): update lightning requirement from <2.5.0,>=1.8.0 to >=1.…

…8.0,<2.6.0 in /requirements (#2879)

build(deps): update lightning requirement in /requirements

Updates the requirements on [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@1.8.0...2.5.0.post0)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements/_docs.txt

@@ -12,7 +12,7 @@ sphinx-copybutton ==0.5.2
 sphinx-autobuild ==2024.10.3
 sphinx-gallery ==0.18.0
 
-lightning >=1.8.0, <2.5.0
+lightning >=1.8.0, <2.6.0
 lightning-utilities ==0.11.9
 pydantic > 1.0.0, < 3.0.0