fix: revert self-dep to ^4.4.0 (v5.0.0 not on npm yet)

Author: molty3000

package.json

@@ -28,7 +28,7 @@
   },
   "homepage": "https://github.com/BackendStack21/0http#readme",
   "devDependencies": {
-    "0http": "^5.0.0",
+    "0http": "^4.4.0",
     "@types/node": "^24.3.2",
     "body-parser": "^2.2.0",
     "chai": "^6.0.1",