avoid deprecation warning in astropy.time.Time

[aelanman]

Assigning to the location attribute will be deprecated in the future. Some logic in lunarsky.time.Time was required to properly handle dimensionless locations (which astropy takes to be EarthLocations), and that required directly setting the location attribute.

This removes the deprecation warning in astropy >= 6.1, while maintaining compatibility with earlier versions.

Closes #27

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.70%. Comparing base (4be9e04) to head (694f4ca).
Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #28      +/-   ##
==========================================
+ Coverage   86.64%   86.70%   +0.06%     
==========================================
  Files           7        8       +1     
  Lines         584      617      +33     
==========================================
+ Hits          506      535      +29     
- Misses         78       82       +4     

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[bhazelton]

Thanks @aelanman, this looks good. I'd just like a small comment in the code to explain what is happening and why.

[bhazelton]

Thanks!