Upgrade vscode version

Author: kddnewton

package.json

@@ -14,7 +14,7 @@
     "url": "https://github.com/ruby-syntax-tree/vscode-syntax-tree/issues"
   },
   "engines": {
-    "vscode": "^1.66.0"
+    "vscode": "^1.68.0"
   },
   "activationEvents": [
     "onLanguage:ruby",