Move to @codemirror/buildhelper 1.0.0

Author: marijnh

package.json

@@ -31,7 +31,7 @@
     "@lezer/python": "^1.1.4"
   },
   "devDependencies": {
-    "@codemirror/buildhelper": "^0.1.0"
+    "@codemirror/buildhelper": "^1.0.0"
   },
   "repository": {
     "type": "git",