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@1.5.0...2.0.0)

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

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

requirements/integrate.txt

@@ -1 +1 @@
-pytorch-lightning>=1.5, <2.0.0
+pytorch-lightning>=1.5, <3.0.0