build(deps-dev): update phpunit/phpunit requirement from 9.5.2 to 9.5.3

Updates the requirements on [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) to permit the latest version.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/master/ChangeLog-9.5.md)
- [Commits](sebastianbergmann/phpunit@9.5.2...9.5.3)

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

composer.json

@@ -59,6 +59,6 @@
 		}
 	},
 	"require-dev": {
-		"phpunit/phpunit": "9.5.2"
+		"phpunit/phpunit": "9.5.3"
 	}
 }