Set gl version in CI only

[codecov[bot]]

Codecov Report

Merging #78 (cf5e060) into dev (5ebed55) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev      #78      +/-   ##
==========================================
+ Coverage   24.01%   24.02%   +0.01%     
==========================================
  Files         188      188              
  Lines       14701    14703       +2     
==========================================
+ Hits         3531     3533       +2     
  Misses      11170    11170              

Files Changed	Coverage Δ
...ppypose/toolbox/renderer/panda3d_scene_renderer.py	73.36% <100.00%> (+0.25%)	:arrow_up:

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[petrikvladimir]

@ElliotMaitre ready to be reviewed/merged to resolve performance issue in #76

[petrikvladimir]

Resolves #74