(fix): bound zarr <3.1

[ilan-gold]

• Until (feat): new zarr dtypes #1995 merges
• Tests added
• Release note added (or unnecessary)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.45%. Comparing base (4b95960) to head (9163c51).
⚠️ Report is 44 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2013      +/-   ##
==========================================
- Coverage   87.47%   85.45%   -2.02%     
==========================================
  Files          46       46              
  Lines        7056     7056              
==========================================
- Hits         6172     6030     -142     
- Misses        884     1026     +142     

see 7 files with indirect coverage changes