Merge remote-tracking branch 'couchbase/morpheus'

* couchbase/morpheus:
  CBD-6348: [BP] [C++20] Add SerialisedDocKey::operator== ...
  CBD-6348: [BP] Various fixes needed to build with C++20
  CBD-6348: [BP] Fix problems with nlohmann and gtest
  CBD-6348: Remove class name in member declaration
  CBD-6348: [BP] Disable fmt format check for WIN32
  CBD-6348: [BP] Changes needed for fmt 10.2
  CBD-6348: [BP] Prepare for nlohmann::json upgrade
  CBD-6348: [BP] Remove deprecated format_to(memory_buffer) overload
  CBD-6348: [BP] Add missing formattors for enum classes
  CBD-6348: Changes required to upgrade boost

Change-Id: I565514f01b1732d204b43e809e691f04ac380753

Author: trondn