Set emscripten-abi==3.1.73 in environment-wasm-host.yml so we get correct versions of packages

Author: mcbarton

environment-wasm-host.yml

@@ -3,6 +3,7 @@ channels:
   - https://repo.mamba.pm/emscripten-forge
   - https://repo.mamba.pm/conda-forge
 dependencies:
+  - emscripten-abi==3.1.73
   - nlohmann_json
   - xeus-lite
   - xeus