Update dependency @fluent/syntax to ^0.18.0

Author: renovate-bot

package.json

@@ -8,7 +8,7 @@
   },
   "bugs": "https://github.com/Demivan/fluent-vue-cli/issues",
   "dependencies": {
-    "@fluent/syntax": "^0.17.0",
+    "@fluent/syntax": "^0.18.0",
     "@vue/compiler-dom": "^3.2.6",
     "@vue/compiler-sfc": "^3.2.6",
     "cac": "^6.7.12",