Update version to 2025.1.0 and refactor version import

[Leguark]

[CLN] Refactor version import in init.py

Replaced gempy version import with a local _version module import for improved modularity and clarity. Removed unnecessary dependency on the gempy module in init.py.

[CLN] Remove outdated PyMC3 tests and update GemPy dependency

Deleted unused test file TEST_pymc3.py as it relied on outdated PyMC3-based code. Updated requirements.txt to use the latest gempy version 2025.1.0.

[Leguark]

• Add benchmarking tests and examples generator for performance analysis #8
• Add thickness likelihood module and refactor existing likelihood functions #7
• Add posterior analysis functionality with saving and visualization #6
• Add probabilistic model examples and tests for GemPy #5
• Reorganize gempy_probability package structure and update imports #4
• Update version to 2025.1.0 and refactor version import #3 👈 (View in Graphite)
• main

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