Update xeus version constraint in YAML file, trigger rebuild of lite deployment (#705)

Author: DerThorsten

environment-wasm-host.yml

@@ -11,7 +11,7 @@ dependencies:
   - pybind11_json
   - numpy
   - xeus-lite
-  - xeus
+  - xeus>=6.0.4
   - pyjs >=4,<5
   - libpython
   - zstd