Disable tests against Optim temporarily

[jishnub]

Given that their CI is currently broken (and has been broken for months now), we may disable the tests against Optim temporarily.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.48%. Comparing base (877375f) to head (812c5e7).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #407   +/-   ##
=======================================
  Coverage   99.48%   99.48%           
=======================================
  Files           8        8           
  Lines        1157     1157           
=======================================
  Hits         1151     1151           
  Misses          6        6           

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