Fix lezer dependency versions

FIX: Fix incorrect versions for @lezer dependencies.

Author: marijnh

package.json

@@ -28,7 +28,7 @@
   "dependencies": {
     "@codemirror/highlight": "^0.19.0",
     "@codemirror/language": "^0.19.0",
-    "@lezer/java": "^0.14.0"
+    "@lezer/java": "^0.15.0"
   },
   "devDependencies": {
     "@codemirror/buildhelper": "^0.1.0"