[deps] Don't pull rayon as a dependency of diskann.

[hildebrandmw]

Avoid rayon as a direct dependency of diskann by disabling default-features in diskann-utils.

[Copilot]

Pull request overview

This PR removes rayon from diskann’s transitive dependency set by opting out of diskann-utils default features (where rayon is enabled by default). This keeps parallelism support available in the workspace (and for crates that explicitly need it) without forcing diskann consumers to pull rayon.

Changes:

• Disable diskann-utils default features in diskann/Cargo.toml to avoid pulling rayon transitively.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.51%. Comparing base (95b6593) to head (56e81e6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1024   +/-   ##
=======================================
  Coverage   89.51%   89.51%           
=======================================
  Files         460      460           
  Lines       85424    85424           
=======================================
  Hits        76469    76469           
  Misses       8955     8955           

Flag	Coverage Δ
miri	89.51% <ø> (ø)
unittests	89.36% <ø> (ø)

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