don't touch the rtm package

Author: WilliamBergamin

.changeset/drop-node18-rtm-api.md

@@ -426,7 +426,7 @@ const rtm = new RTMClient(token, {
 
 ## Requirements
 
-This package supports Node v20 and higher. It's highly recommended to use [the latest LTS version of
+This package supports Node v18 and higher. It's highly recommended to use [the latest LTS version of
 node](https://github.com/nodejs/Release#release-schedule), and the documentation is written using syntax and features
 from that version.
 

packages/rtm-api/README.md

@@ -22,7 +22,7 @@
     "dist/**/*"
   ],
   "engines": {
-    "node": ">=20",
+    "node": ">=18",
     "npm": ">=8.6.0"
   },
   "repository": {
@@ -47,7 +47,7 @@
   "dependencies": {
     "@slack/logger": "^4",
     "@slack/web-api": "^7.10.0",
-    "@types/node": ">=20",
+    "@types/node": ">=18",
     "eventemitter3": "^5",
     "finity": "^0.5.4",
     "p-cancelable": "^2",