chore(deps): update dependency phpunit/phpunit to v13

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

Author: renovate[bot]

composer.json

@@ -18,7 +18,7 @@
     "nextcloud/coding-standard": "^v1.4.0",
     "nextcloud/ocp": "dev-stable31",
     "staabm/annotate-pull-request-from-checkstyle": "^1.8.6",
-    "phpunit/phpunit": "^9",
+    "phpunit/phpunit": "^13",
     "psalm/phar": "^5.26.1"
   },
   "config": {