Update Node.js to v20

Author: renovate[bot]

config/functions/package.json

@@ -8,6 +8,6 @@
   },
   "private": true,
   "engines": {
-    "node": "16"
+    "node": "20"
   }
 }

package.json

@@ -78,7 +78,7 @@
     "@types/long": "4.0.2",
     "@types/mocha": "9.1.1",
     "@types/mz": "2.7.4",
-    "@types/node": "12.20.50",
+    "@types/node": "20.8.9",
     "@types/request": "2.48.8",
     "@types/sinon": "9.0.11",
     "@types/sinon-chai": "3.2.9",

packages/rules-unit-testing/functions/package.json

@@ -12,6 +12,6 @@
     "firebase-functions": "3.24.1"
   },
   "engines": {
-    "node": "16"
+    "node": "20"
   }
 }