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 92.06%. Comparing base (b035da1) to head (83803fc).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #36      +/-   ##
===========================================
- Coverage    92.59%   92.06%   -0.53%     
===========================================
  Files            5        5              
  Lines          135      126       -9     
  Branches        47       47              
===========================================
- Hits           125      116       -9     
  Misses           6        6              
  Partials         4        4              

see 3 files with indirect coverage changes

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