MNT: bump to main branch of c-blosc to fix gcc15 compilation

[tacaswell]

close #750

[Description of PR]

TODO:

• Unit tests and/or doctests in docstrings
• Tests pass locally
• [/] Docstrings and API docs for any new/modified user-facing classes and functions
• [/] Changes documented in docs/release.rst
• [/] Docs build locally
• GitHub Actions CI passes
• [/] Test coverage to 100% (Codecov passes)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (633d57d) to head (ffdc711).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #772   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           64        64           
  Lines         2804      2804           
=========================================
  Hits          2804      2804           

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[tacaswell]

Looks like the CI failures are fixed by #766 ?