deps: Update dependency sparse to >=0.19.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
sparse	feature-backends	minor	>=0.18.0 → >=0.19.0

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Release Notes

pydata/sparse (sparse)

v0.19.0: Version 0.19.0

Compare Source

What's Changed

• fix: return 0-D array for full reductions per Array API standard by @​Abineshabee in #​932
• perf: short-circuit COO.reshape when -1 resolves to self.shape by @​thodson-usgs in #​935
• test: bump array-api-tests to v2025.12 by @​prady0t in #​942
• fix: treat NaN values as distinct in unique_values and unique_counts by @​gaoflow in #​945
• Array API 2025.12 support by @​hameerabbasi in #​943

New Contributors

• @​Abineshabee made their first contribution in #​932
• @​thodson-usgs made their first contribution in #​935
• @​gaoflow made their first contribution in #​945

Full Changelog: pydata/sparse@0.18.0...0.19.0

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