Update old error messages on valid nodejs runtimes. (#5784)

Co-authored-by: joehan <joehanley@google.com>

Author: taeold

src/deploy/functions/runtimes/node/parseRuntimeAndValidateSDK.ts

@@ -24,16 +24,16 @@ const ENGINE_RUNTIMES_NAMES = Object.values(ENGINE_RUNTIMES);
 export const RUNTIME_NOT_SET =
   "`runtime` field is required but was not found in firebase.json.\n" +
   "To fix this, add the following lines to the `functions` section of your firebase.json:\n" +
-  '"runtime": "nodejs16"\n';
+  '"runtime": "nodejs18"\n';
 
 export const UNSUPPORTED_NODE_VERSION_FIREBASE_JSON_MSG = clc.bold(
   `functions.runtime value is unsupported. ` +
-    `Valid choices are: ${clc.bold("nodejs{10|12|14|16}")}.`
+    `Valid choices are: ${clc.bold("nodejs{10|12|14|16|18}")}.`
 );
 
 export const UNSUPPORTED_NODE_VERSION_PACKAGE_JSON_MSG = clc.bold(
   `package.json in functions directory has an engines field which is unsupported. ` +
-    `Valid choices are: ${clc.bold('{"node": 10|12|14|16}')}`
+    `Valid choices are: ${clc.bold('{"node": 10|12|14|16|18}')}`
 );
 
 export const DEPRECATED_NODE_VERSION_INFO =