chore(deps): Bump version to 4.0.1 and update undici

- Why: Release v4.0.1 with security fixes and version sync
- What: Version bump 4.0.0 → 4.0.1 in package.json/package-lock.json, undici 7.16.0 → 7.21.0

Author: gido

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "esti-mate",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "description": "Your Harvest estimate's best friend",
   "main": "src/index.js",
   "type": "module",