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 94.78%. Comparing base (ea15c57) to head (9d3a7ab).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #44      +/-   ##
===========================================
- Coverage    95.23%   94.78%   -0.46%     
===========================================
  Files           35       35              
  Lines         1722     1533     -189     
  Branches       538      538              
===========================================
- Hits          1640     1453     -187     
+ Misses          38       36       -2     
  Partials        44       44              

see 28 files with indirect coverage changes

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