chore: update yarn to v4

Author: renovate[bot]

package.json

@@ -5,7 +5,7 @@
   "main": "dist-cjs/cli/main",
   "bin": "dist-cjs/cli/main.js",
   "repository": "[email protected]:prisma-labs/dripip.git",
-  "packageManager": "yarn@3.2.0",
+  "packageManager": "yarn@4.9.1",
   "author": "Jason Kuhrt <[email protected]>",
   "license": "MIT",
   "files": [