Remove dependencies on Boost.StaticAssert

[Lastique]

Boost.StaticAssert has been merged into Boost.Config, so remove the dependency.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.29%. Comparing base (1d670c8) to head (5fcc096).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1351   +/-   ##
========================================
  Coverage    95.29%   95.29%           
========================================
  Files          814      814           
  Lines        67422    67422           
========================================
  Hits         64249    64249           
  Misses        3173     3173           

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