Block zarr 3.0.0a5, 3.0.0a6

[Czaki]

References and relevant issues

Because of astral-sh/uv#6640

Description

Block 3.0.0a5, 3.0.0a6 to make update constraints work again

[jni]

@Czaki this is not needed if we update and merge #7215, right? I was thinking of pushing the suggested changes to it after tagging 0.5.4.

[Czaki]

@Czaki this is not needed if we update and merge #7215, right? I was thinking of pushing the suggested changes to it after tagging 0.5.4.

This is still needed as we do not want to have alpha in our constraints files. And there is a bug in uv https://github.com/astral-sh/uv/issues/6640 that we need to solve.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.73%. Comparing base (c73e9d5) to head (2a2e70c).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7305      +/-   ##
==========================================
- Coverage   92.85%   92.73%   -0.13%     
==========================================
  Files         623      623              
  Lines       57463    57463              
==========================================
- Hits        53360    53288      -72     
- Misses       4103     4175      +72     

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