build(deps): update pytorch-lightning requirement from <2.6.0,>=1.9.0 to >=1.9.0,<2.7.0 in /requirements (#3347)

build(deps): update pytorch-lightning requirement in /requirements

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@1.9.0...2.6.1)

---
updated-dependencies:
- dependency-name: pytorch-lightning
  dependency-version: 2.6.1
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements/_integrate.txt

@@ -1,4 +1,4 @@
 # contentiously validated integration with these expected ranges
 
 # ToDo: investigate and add validation with 2.0+ on GPU
-pytorch-lightning >=1.9.0, <2.6.0
+pytorch-lightning >=1.9.0, <2.7.0