use xeus-javascript release (#3904)

Author: DerThorsten

recipes/recipes_emscripten/xeus-javascript/recipe.yaml

@@ -1,20 +1,16 @@
 context:
-  version: 0.4.0
+  version: 0.4.2
 
 package:
   name: xeus-javascript
   version: ${{ version }}
 
 source:
-  # url: https://github.com/jupyter-xeus/xeus-javascript/archive/refs/tags/${{ version
-  #   }}.tar.gz
-  # sha256: d65edb4ce21aa066b08e091efed77c33b7911929075251afe195adef296afb79
-  # path: /Users/thorstenbeier/src/xeus-javascript
-  git: https://github.com/jupyter-xeus/xeus-javascript
-  branch: 4x
+  url: https://github.com/jupyter-xeus/xeus-javascript/archive/refs/tags/${{version}}.tar.gz
+  sha256: c37f1fb43a3cf0e65a2bc0593083b242fdb40d527667b861bfb41866416d8214
 
 build:
-  number: 3
+  number: 0
 
 requirements:
   build: