Bump split2 from 3.2.2 to 4.0.0 (#26)

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

@@ -24,7 +24,7 @@
   "homepage": "https://github.com/pinojs/pino-abstract-transport#readme",
   "dependencies": {
     "duplexify": "^4.1.2",
-    "split2": "^3.2.2"
+    "split2": "^4.0.0"
   },
   "devDependencies": {
     "husky": "^7.0.0",