Update to use CppInterOp 1.4.0

[anutosh491]

Description

Now that cppinterop 1.4.0 is available on conda-forge and emscripten-forge, this PR tries to update xeus-cpp to use the latest version. The new release (0.6.0) for xeus-cpp should be made using that version hopefully

Type of change

Please tick all options which are relevant.

• Bug fix
• New feature
• Added/removed dependencies
• Required documentation updates

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.14%. Comparing base (a173037) to head (8885814).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #165   +/-   ##
=======================================
  Coverage   80.14%   80.14%           
=======================================
  Files          19       19           
  Lines         972      972           
  Branches       93       93           
=======================================
  Hits          779      779           
  Misses        193      193           

[anutosh491]

Though I made the update for cppinterop on emscripten-forge. I am improving the llvm recipe we have (emscripten-forge/recipes#1384) and then I shall rebuild cppinterop to use this llvm. That should be a better, cleaner and more efficient build.