updating ubuntu image

[katiebreivik]

docker was still busted, so I'm trying a new image

[codecov[bot]]

Codecov Report

Merging #565 (8486b5c) into develop (66def00) will increase coverage by 0.33%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #565      +/-   ##
===========================================
+ Coverage    87.12%   87.45%   +0.33%     
===========================================
  Files           40       40              
  Lines        25386    25400      +14     
===========================================
+ Hits         22117    22212      +95     
+ Misses        3269     3188      -81     

Impacted Files	Coverage Δ
cosmic/sample/cmc/elson.py	88.24% <0.00%> (-0.65%)	:arrow_down:
cosmic/bse_utils/zdata.py	100.00% <0.00%> (ø)
cosmic/bse_utils/zcnsts.py	100.00% <0.00%> (ø)
cosmic/sample/initialcmctable.py	95.49% <0.00%> (+0.14%)	:arrow_up:
cosmic/sample/initialbinarytable.py	94.44% <0.00%> (+0.16%)	:arrow_up:
cosmic/evolve.py	89.58% <0.00%> (+34.17%)	:arrow_up:

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