Fix build

[pquentin]

• The latest release of SimSIMD breaks mypy: Bug: README example rejected by mypy (incompatible type "ndarray[...]"; expected "memoryview") ashvardanian/SimSIMD#171
• Sphinx 8 is not supported by the Sphinx RTD theme, which downgrades to 0.5 unless forced to 2.0+

[github-actions]

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[pquentin]

Closing since ashvardanian/SimSIMD#171 was fixed at warp speed and #2652 already includes the docs fix.