Update dependency phpunit/phpunit to v12

| datasource | package         | from   | to     |
| ---------- | --------------- | ------ | ------ |
| packagist  | phpunit/phpunit | 9.6.17 | 12.0.2 |


Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

composer.json

@@ -56,7 +56,7 @@
         "laminas/laminas-development-mode": "^3.11",
         "mezzio/mezzio-tooling": "^2.8",
         "phpspec/prophecy-phpunit": "^2.0.2",
-        "phpunit/phpunit": "^9.6.13",
+        "phpunit/phpunit": "^12.0.0",
         "roave/security-advisories": "dev-master",
         "squizlabs/php_codesniffer": "^3.7.2"
     },