Allow more-itertools 11

[abrookins]

Supersedes #825. Updates the direct requirement and the corresponding uv.lock metadata.

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Note

Low Risk
Dependency constraint-only change with no application logic updates; low risk unless more-itertools 11 introduces a breaking change for ichunked (unlikely for a minor major bump within allowed range).

Overview
Relaxes the more-itertools upper bound from <11.0 to <12.0 in pyproject.toml and syncs the same specifier in uv.lock.

This lets environments resolve more-itertools 11.x alongside redis-om without changing library code; existing usage (e.g. ichunked in the model layer) stays the same.

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