Update constraint cf_xarray >=0.7.3 to workaround xarray import issue

[tomvothecoder]

Description

• Closes [Bug]: Can't import xcdat after updating from 0.3.0 to 0.5.0 (module 'xarray.core' has no attribute 'resample') #543

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

Patch and project coverage have no change.

Comparison is base (d6908db) 100.00% compared to head (53e64d9) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #547   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           15        15           
  Lines         1592      1592           
=========================================
  Hits          1592      1592           

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