Update dependency Blosc/c-blosc2 to v3.2.1

[wongcht]

This PR contains the following updates:

Package	Update	Change
Blosc/c-blosc2	minor	3.1.5 → 3.2.1

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Release Notes

Blosc/c-blosc2 (Blosc/c-blosc2)

v3.2.1

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#XXX version-specific blurb XXX#

v3.2.0

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• New blosc2_schunk_refresh() API: an explicit, data-free re-sync point
  for a plain blosc2_schunk reader handle in a Growth-SWMR setup, mirroring
  b2nd_refresh() for b2nd arrays. Useful for polling for another handle's
  changes without touching data.

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