Bump version and tweak tests for 0.6

[BradyAJohnston]

There are going to be some compatibility issues once Blender 5.1 is released (change to python 3.13) so I'll create a final 0.6.* release and then 0.7 going forward will be targeted at Blender bpy>=5.1.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.57%. Comparing base (ad11e9c) to head (d0ab1a6).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #68   +/-   ##
=======================================
  Coverage   90.57%   90.57%           
=======================================
  Files          13       13           
  Lines         785      785           
=======================================
  Hits          711      711           
  Misses         74       74           

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