chore(deps): bump rector/rector from 2.3.8 to ^2.3.9 (#12652)

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

Author: renovate[bot]

vendor-bin/rector/composer.json

@@ -1,6 +1,6 @@
 {
     "require-dev": {
-        "rector/rector": "^2.3.8",
+        "rector/rector": "^2.3.9",
         "nextcloud/rector": "^0.4.1"
     }
 }