Bump split2 from 3.2.2 to 4.0.0 (#49)

Bumps [split2](https://github.com/mcollina/split2) from 3.2.2 to 4.0.0.
- [Release notes](https://github.com/mcollina/split2/releases)
- [Commits](mcollina/split2@v3.2.2...v4.0.0)

---
updated-dependencies:
- dependency-name: split2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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package.json

@@ -49,6 +49,6 @@
     "pino": "^6.9.0",
     "pump": "^3.0.0",
     "readable-stream": "^3.6.0",
-    "split2": "^3.2.2"
+    "split2": "^4.0.0"
   }
 }