Upgraded to latest xeus and nlohmann_json

Author: JohanMabille

environment-dev.yml

@@ -3,13 +3,13 @@ channels:
 - conda-forge
 dependencies:
   # Build dependencies
-- cmake
+- cmake <4
 - cxx-compiler
 - ninja
   # Host dependencies
 - xeus>=5.0.0,<6
-- xproperty=0.12.0
-- nlohmann_json=3.11.3
+- xproperty=0.12.1
+- nlohmann_json=3.12.0
   # Test dependencies
 - doctest >= 2.4.6
 - json_schema_validator