cloudpickle consistently

[AlexanderFengler]

This pull request includes a version bump for the package and a change to the serialization library used in the ssms/dataset_generators/lan_mlp.py module.

Versioning:

• Updated the package version from 0.12.1 to 0.12.2 in pyproject.toml to reflect the new release.

Dependency update:

• Switched from the standard pickle module to cloudpickle for serialization in ssms/dataset_generators/lan_mlp.py, which can improve compatibility with more complex Python objects.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Flag	Coverage Δ
unittests	91.35% <100.00%> (-0.14%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
ssms/dataset_generators/lan_mlp.py	93.57% <100.00%> (ø)

... and 1 file with indirect coverage changes

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