Update cloudpickle requirement in /.github/dependabot

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@0.1.0...v3.1.0)

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

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

.github/dependabot/constraints.txt

@@ -1,4 +1,4 @@
-cloudpickle<=3.0.0
+cloudpickle<=3.1.0
 coverage==7.6.3
 h5py<3.13.0
 karabo-bridge==0.7.0