remove static_assert dependencies from CMakeLists to support boost 1.91.0

[miyanyan]

boost 1.91.0 release notes:

[StaticAssert](https://www.boost.org/libs/static_assert/) has been merged into [Config](https://www.boost.org/libs/config/). 
This includes code, tests and documentation. For backward compatibility git submodule, CMake and b2 targets of StaticAssert are still available; 
the targets simply introduce a dependency on Config. Eventually, the submodule and targets will be removed. 
Users are recommended to update their dependencies on StaticAssert to replace it with Config. 
No C++ code modifications are necessary. Most Boost libraries have been updated accordingly.

https://www.boost.org/releases/latest/