Update dependency vimeo/psalm to ^6.15.0

| datasource | package     | from   | to     |
| ---------- | ----------- | ------ | ------ |
| packagist  | vimeo/psalm | 6.14.3 | 6.15.0 |

Author: renovate[bot]

composer.json

@@ -34,7 +34,7 @@
         "psalm/plugin-phpunit": "^0.19.5",
         "symfony/cache": "^7.4.5",
         "symfony/yaml": "^7.4.1",
-        "vimeo/psalm": "^6.14.3"
+        "vimeo/psalm": "^6.15.0"
     },
     "autoload": {
         "psr-4": {