Don't warn if using a node version greater than 20

package.json

@@ -5,7 +5,7 @@
   "version": "1.10.3",
   "description": "GitHub Action for creating a GitHub App Installation Access Token",
   "engines": {
-    "node": ">=20.16.0 <21"
+    "node": ">=20.16.0"
   },
   "scripts": {
     "build": "esbuild main.js post.js --bundle --outdir=dist --out-extension:.js=.cjs --platform=node --target=node20 --packages=bundle",