fix: update to node.js 22 runtime

Author: steveoh

firebase.json

@@ -2,7 +2,7 @@
   "functions": [
     {
       "source": "functions",
-      "runtime": "nodejs20",
+      "runtime": "nodejs22",
       "codebase": "default",
       "ignore": ["node_modules", ".git", "firebase-debug.log", "firebase-debug.*.log"]
     }

functions/package-lock.json

@@ -54,6 +54,6 @@
     "semi": true
   },
   "engines": {
-    "node": "20"
+    "node": "22"
   }
 }

functions/package.json

@@ -132,6 +132,6 @@
     "wait-on": "^8.0.2"
   },
   "engines": {
-    "node": "20"
+    "node": "22"
   }
 }