Remove dependencies on Boost.StaticAssert

[Lastique]

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

[mborland]

Thank you!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.79%. Comparing base (1d68620) to head (17537c7).
⚠️ Report is 3 commits behind head on develop.

Additional details and impacted files

@@ Coverage Diff @@## develop #152 +/- ##
========================================
Coverage 95.79% 95.79% ========================================
Files 117 117 Lines 7664 7664 ========================================
Hits 7342 7342 Misses 322 322 

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1d68620...17537c7. Read the comment docs.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.