fix: ChunkCoords definition

[LDeakin]

Broken since #3374

TODO:

• Add unit tests and/or doctests in docstrings
• Add docstrings and API docs for any new/modified user-facing classes and functions
• New/modified features documented in docs/user-guide/*.rst
• Changes documented as a new file in changes/
• GitHub Actions have all passed
• Test coverage is 100% (Codecov passes)

[d-v-b]

good fix, sorry for the breakage!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.92%. Comparing base (7d43f32) to head (2ed9e0c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3425   +/-   ##
=======================================
  Coverage   94.92%   94.92%           
=======================================
  Files          79       79           
  Lines        9503     9503           
=======================================
  Hits         9021     9021           
  Misses        482      482           

Files with missing lines	Coverage Δ
src/zarr/core/common.py	93.33% <100.00%> (ø)

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