build(deps): update cloudpickle requirement in /requirements

Updates the requirements on [cloudpickle](https://github.com/cloudpipe/cloudpickle) to permit the latest version.
- [Release notes](https://github.com/cloudpipe/cloudpickle/releases)
- [Changelog](https://github.com/cloudpipe/cloudpickle/blob/master/CHANGES.md)
- [Commits](cloudpipe/cloudpickle@v1.4.0...3.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements/_tests.txt

@@ -13,5 +13,5 @@ psutil <5.10.0
 requests <=2.31.0
 fire <=0.5.0
 
-cloudpickle >1.3, <=2.2.1
+cloudpickle >1.3, <=3.0.0
 scikit-learn >=1.1.1, <1.4.0