QuadratiK Version 1.1.5
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This version includes -
    1. **[NEW]** Added spherical PCA functionality.
    2. **[FIX]** Updated type hints to use Python 3.10+ union syntax.
    3. **[FIX]** Fixed numerical precision issues with log and exp in clustering code (PKBC).
    4. **[FIX]** Improved plotting for ``select_h`` function.