Remove ome-zarr from dependencies in pyproject.toml. Replace with zarr

[will-moore]

I realised when reviewing conda-forge/napari-ome-zarr-feedstock#15
that I hadn't actually removed ome-zarr as a dependency (should have done that in #123)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.82%. Comparing base (40bc4a4) to head (d4f035b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #152   +/-   ##
=======================================
  Coverage   86.82%   86.82%           
=======================================
  Files           5        5           
  Lines         516      516           
=======================================
  Hits          448      448           
  Misses         68       68           

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[will-moore]

@jo-mueller OK to get this in and release as 0.8.1?