Add support for Python 3.14

[tomvothecoder]

Description

Closes #808
Related to #813

This PR adds support for Python 3.14 by updating Python version constraints across configuration files and tooling versions. The main technical changes involve improving type safety for mypy by introducing a type assertion helper function and updating type annotations to properly handle xarray's hashable keys.

Key Changes

• Added Python 3.14 to supported versions in configuration files and CI/CD workflows
• Updated development tools (ruff, mypy, pre-commit-hooks) to newer versions
• Introduced _as_dataarray() helper function to preserve type information when using NumPy ufuncs with xarray DataArrays

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 (affce83) to head (b8d0734).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #822   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           18        18           
  Lines         1969      1973    +4     
=========================================
+ Hits          1969      1973    +4     

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[Copilot]

Pull request overview

This PR adds support for Python 3.14 by updating Python version constraints across configuration files and tooling versions. The main technical changes involve improving type safety for mypy by introducing a type assertion helper function and updating type annotations to properly handle xarray's hashable keys.

Key Changes

• Added Python 3.14 to supported versions in configuration files and CI/CD workflows
• Updated development tools (ruff, mypy, pre-commit-hooks) to newer versions
• Introduced _as_dataarray() helper function to preserve type information when using NumPy ufuncs with xarray DataArrays

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
pyproject.toml	Added Python 3.14 classifier to project metadata
conda-env/dev.yml	Removed Python version upper bound and updated ruff/mypy versions
conda-env/ci.yml	Removed Python version upper bound for CI environment
.pre-commit-config.yaml	Updated pre-commit hooks to match conda environment versions
.github/workflows/build_workflow.yml	Added Python 3.14 to test matrix
xcdat/utils.py	Changed return type from list[str] to list[Hashable] for compare_datasets() and added _as_dataarray() type assertion helper
xcdat/spatial.py	Applied _as_dataarray() wrapper to preserve type information after NumPy operations
xcdat/mask.py	Applied _as_dataarray() wrapper to preserve type information after np.logical_and()
xcdat/dataset.py	Removed unnecessary sorted() call when creating a set
tests/test_utils.py	Updated tests to use set comparisons instead of sorted lists and added tests for _as_dataarray()

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