Update league/event requirement from ^2.2 to ^3.0

Updates the requirements on [league/event](https://github.com/thephpleague/event) to permit the latest version.
- [Release notes](https://github.com/thephpleague/event/releases)
- [Changelog](https://github.com/thephpleague/event/blob/master/changelog.md)
- [Commits](thephpleague/event@2.2.0...3.0.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

composer.json

@@ -6,7 +6,7 @@
     "require": {
         "php": "^7.2 || ^8.0",
         "ext-openssl": "*",
-        "league/event": "^2.2",
+        "league/event": "^3.0",
         "lcobucci/jwt": "^3.4 || ^4.0",
         "psr/http-message": "^1.0.1",
         "defuse/php-encryption": "^2.2.1",