Checks to cube convolution and linmos

[tjgalvin]

In astropy==6.1.4 a change was made to how astropy.units.Units with 0 scale are handled. This caused a collection of errors and confusion.

In this change I have pinned astropy to 6.1.3 while the main up-stream module radio-beam is fixed.

Throughout this debugging process I have also broken about the cube convolution test, and am using the process executor.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.79%. Comparing base (719ec89) to head (8f493c4).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #176      +/-   ##
==========================================
+ Coverage   59.54%   59.79%   +0.24%     
==========================================
  Files          33       33              
  Lines        5686     5686              
==========================================
+ Hits         3386     3400      +14     
+ Misses       2300     2286      -14     

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