nanoflann 1.5.5

[BrewTestBot]

Created by brew bump

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Created with brew bump-formula-pr.

release notes

## What's Changed
* CMake: Bump minimum version by @jschueller in https://github.com/jlblancoc/nanoflann/pull/230
* Improved concurrency for multi-threaded indexing by @nigels-com in https://github.com/jlblancoc/nanoflann/pull/236
New Contributors

@jschueller made their first contribution in CMake: Bump minimum version jlblancoc/nanoflann#230
@nigels-com made their first contribution in Improved concurrency for multi-threaded indexing jlblancoc/nanoflann#236

Full Changelog: jlblancoc/nanoflann@v1.5.4...v1.5.5
(See full discussion on the need to benchmark your data in jlblancoc/nanoflann#236 )
For 4 threads vs 1 thread

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