refactor: Apply rector changes

Signed-off-by: GitHub <noreply@github.com>

Author: nextcloud-command

composer.json

@@ -43,7 +43,6 @@
     "rector": "rector && composer cs:fix"
   },
   "require-dev": {
-    "nextcloud/ocp": "dev-master",
     "bamarni/composer-bin-plugin": "^1.8"
   }
 }

composer.lock

@@ -71,7 +71,7 @@ protected function setRichSubject(
 		foreach ($ak as $k) {
 			$subAk = array_keys($data[$k]);
 			foreach ($subAk as $sK) {
-				if (str_starts_with($sK, '_')) {
+				if (str_starts_with((string)$sK, '_')) {
 					unset($data[$k][$sK]);
 				}
 			}