Bump cloudpickle from 2.2.1 to 3.0.0 in /tests (#50)

Bumps [cloudpickle](https://github.com/cloudpipe/cloudpickle) from 2.2.1 to 3.0.0.
- [Release notes](https://github.com/cloudpipe/cloudpickle/releases)
- [Changelog](https://github.com/cloudpipe/cloudpickle/blob/master/CHANGES.md)
- [Commits](cloudpipe/cloudpickle@v2.2.1...3.0.0)

---
updated-dependencies:
- dependency-name: cloudpickle
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

tests/requirements.txt

@@ -1,7 +1,7 @@
 aiofiles==23.2.1
 asyncssh==2.14.0
 black==23.9.1
-cloudpickle==2.2.1
+cloudpickle==3.0.0
 covalent==0.228.0rc0
 flake8==6.1.0
 isort==5.12.0