ci: upgrade pnpm to version 9

- Add engines field to package.json
- Lock pnpm to version 9.0.6 with corepack

Author: thebuilder

package.json

@@ -20,12 +20,17 @@
     }
   },
   "author": "Daniel Schmidt",
+  "license": "MIT",
   "sideEffects": false,
   "repository": {
     "type": "git",
     "url": "https://github.com/thebuilder/react-intersection-observer.git"
   },
-  "license": "MIT",
+  "engines": {
+    "node": ">=18",
+    "pnpm": ">=9"
+  },
+  "packageManager": "pnpm@9.0.6+sha256.0624e30eff866cdeb363b15061bdb7fd9425b17bc1bb42c22f5f4efdea21f6b3",
   "scripts": {
     "prebuild": "rm -rf dist lib",
     "build": "run-s build:*",
@@ -37,7 +42,7 @@
     "dev": "run-p dev:*",
     "dev:package": "tsup src/index.tsx --watch",
     "dev:storybook": "pnpm --filter storybook dev",
-    "lint": "biome lint .",
+    "lint": "biome check .",
     "release": "np --contents dist",
     "version": "pnpm build",
     "storybook:build": "pnpm build:bundle && pnpm --filter storybook build",