Update pestphp/pest requirement from ^2.15 to ^3.1

Updates the requirements on [pestphp/pest](https://github.com/pestphp/pest) to permit the latest version.
- [Release notes](https://github.com/pestphp/pest/releases)
- [Changelog](https://github.com/pestphp/pest/blob/3.x/RELEASE.md)
- [Commits](pestphp/pest@v2.15.0...v3.1.0)

---
updated-dependencies:
- dependency-name: pestphp/pest
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

composer.json

@@ -20,7 +20,7 @@
         "phrity/websocket": "^3.0"
     },
     "require-dev": {
-        "pestphp/pest": "^2.15",
+        "pestphp/pest": "^3.1",
         "laravel/pint": "^1.0",
         "spatie/ray": "^1.28"
     },