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 78.00%. Comparing base (26800d3) to head (85de5bf).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #48      +/-   ##
===========================================
- Coverage    78.40%   78.00%   -0.40%     
===========================================
  Files           22       22              
  Lines          963      923      -40     
  Branches       364      364              
===========================================
- Hits           755      720      -35     
+ Misses         201      196       -5     
  Partials         7        7              

see 7 files with indirect coverage changes

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