[PHP]: Update vimeo/psalm requirement in /vendor-bin/phpunit

Updates the requirements on [vimeo/psalm](https://github.com/vimeo/psalm) to permit the latest version.
- [Release notes](https://github.com/vimeo/psalm/releases)
- [Commits](vimeo/psalm@4.6.4...v4.15.0)

---
updated-dependencies:
- dependency-name: vimeo/psalm
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

vendor-bin/phpunit/composer.json

@@ -3,7 +3,7 @@
         "dg/bypass-finals": "^1.3",
         "phpunit/phpunit": "9.5.10",
         "symfony/phpunit-bridge": "6.0.0",
-        "vimeo/psalm": "4.6.4",
+        "vimeo/psalm": "4.15.0",
         "psalm/plugin-phpunit": "0.16.1"
     }
 }