[skip ci] Update dependency firebase-functions-test to v0.2.3

Author: renovate-bot

functions/package.json

@@ -18,7 +18,7 @@
   },
   "devDependencies": {
     "typescript": "3.9.7",
-    "firebase-functions-test": "0.2.2"
+    "firebase-functions-test": "0.2.3"
   },
   "private": true
 }