WiredTiger's current minimum supported version is 3.10, however on Apple Silicon this is actually 3.19.2, and we now use features like cmake_language that required 3.18 or newer.

This ticket is to update the minimum version of cmake to 3.21.2 to align with the current version used in the V4 mongotoolchain. The changes required are:

• Update our Tool, compiler and language standard versions wiki page with the new version
• Update the cmake_minimum_required checks present in all of our CMakeLists.txt and *.cmake files