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 93.33%. Comparing base (2358570) to head (477d386).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #91      +/-   ##
===========================================
- Coverage    94.73%   93.33%   -1.41%     
===========================================
  Files            5        5              
  Lines           19       15       -4     
  Branches         3        3              
===========================================
- Hits            18       14       -4     
  Misses           1        1              

see 1 file with indirect coverage changes

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