Unpin jupyterlite-xeus in lite build (#541)

Author: martinRenou

.github/workflows/build.yml

@@ -219,8 +219,8 @@ jobs:
           create-args: >-
             python=3.10
             pip
-            jupyterlite-core>=0.2.0,<0.3.0
-            jupyterlite-xeus>=0.1.2,<0.2
+            jupyterlite-core
+            jupyterlite-xeus
 
       - name: Download extension package
         uses: actions/download-artifact@v3