Pinning astroquery and updating code to handle astroquery 0.4.8 changes

[dr-rodriguez]

Astroquery 0.4.8 introduced a breaking change in the Simbad API by having all lower-case names. This fix updates that and pins the version being used.

Closes #90

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.35%. Comparing base (6fde6fe) to head (8093d34).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #92      +/-   ##
==========================================
+ Coverage   95.34%   95.35%   +0.01%     
==========================================
  Files          10       10              
  Lines        1116     1119       +3     
==========================================
+ Hits         1064     1067       +3     
  Misses         52       52              

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