docs: require NPM v9

coderbyheart · coderbyheart · commit 4eeea67f1327 · 2023-03-08T15:07:11.000+01:00
See https://github.blog/changelog/2022-11-09-npm-cli-v9-is-now-generally-available/ BREAKING CHANGE: NPM v9 is now required
diff --git a/package.json b/package.json
@@ -32,7 +32,7 @@
   },
   "engines": {
     "node": ">=18",
-    "npm": ">=8"
+    "npm": ">=9"
   },
   "release": {
     "branches": [
