Block zarr 3.0.0a1 and 3.0.0a2 in pre-release tests (napari#7217)

# References and relevant issues

closes napari#7193

# Description

When try to fix zarr problems with zarr 3.0.0 in napari#7215 I have found that
it is not easy with this release, so I prefer to block 3.0.0a1 release
and open issue in zarr

resources/constraints/version_denylist.txt

@@ -5,4 +5,4 @@ PySide6 != 6.4.3, !=6.5.0, !=6.5.1, !=6.5.1.1, !=6.5.2, != 6.5.3, != 6.6.0, != 6
 pytest-json-report
 pyopengl!=3.1.7
 tensorstore!=0.1.38
-zarr!=3.0.0a0
+zarr!=3.0.0a0,!=3.0.0a1,!=3.0.0a2