Fix RescaleObservation on Windows

[traversaro]

Description

np.float128 is not available on all platforms (in particular is missing on Windows). This PR uses np.float128 on the platforms in which it is available, but fallbacks to np.float64 if np.float128 is not available.

Fix conda-forge/gymnasium-feedstock#36 (comment) .

Type of change

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• Documentation only change (no code changed)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

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Checklist:

• I have run the pre-commit checks with pre-commit run --all-files (see CONTRIBUTING.md instructions to set it up)
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes