Constrain regionmask >=0.11.0 for numpy 2.0 compatibility

[tomvothecoder]

Description

• Closes [Bug]: conda solver picks numpy-2-incompatible regionmask 0.4.0 alongside xcdat in some envs #837

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

If applicable:

• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass with my changes (locally and CI/CD build)
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have noted that this is a breaking change for a major release (fix or feature that would cause existing functionality to not work as expected)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (baf02ae) to head (fa79129).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #838   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           18        18           
  Lines         1989      1989           
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  Hits          1989      1989           

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[Copilot]

Pull request overview

Updates xCDAT’s dependency constraints to avoid installing NumPy-2-incompatible regionmask versions, addressing import failures caused by older regionmask releases.

Changes:

• Add regionmask >=0.11.0 to the runtime dependencies in pyproject.toml.
• Pin regionmask >=0.11.0 in the dev and CI conda environment definitions.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
pyproject.toml	Constrains regionmask minimum version in PyPI/runtime metadata.
conda-env/dev.yml	Pins regionmask minimum version for the development conda environment.
conda-env/ci.yml	Pins regionmask minimum version for the CI conda environment.