Pin Dask dependency to avoid dask-expr

[wilsonbb]

As noted in #382, we currently do not support dask-expr as a backend, however it became the default Dask backend with the release of Dask 2024.3.0 (See dask/community#366)

Here we pin Dask to be in a range below this version until dask-expr support is fully added.

Additionally in the LSDB notebook, we update the cone_search call to use the new radius_arcsec argument (formerly just radius)

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[github-actions]

Before [f740b6f] <v0.3.4>	After [801b9ea]	Ratio	Benchmark (Parameter)
59.1±7ms	47.4±0.5ms	~0.80	benchmarks.time_batch
49.5±0.7ms	51.0±1ms	1.03	benchmarks.time_prune_sync_workflow

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.53%. Comparing base (f740b6f) to head (5ad5c21).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #387   +/-   ##
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  Coverage   95.53%   95.53%           
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  Files          25       25           
  Lines        1702     1702           
=======================================
  Hits         1626     1626           
  Misses         76       76           

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