Bump phpstan/phpstan-symfony from 2.0.14 to 2.0.15

Bumps [phpstan/phpstan-symfony](https://github.com/phpstan/phpstan-symfony) from 2.0.14 to 2.0.15.
- [Release notes](https://github.com/phpstan/phpstan-symfony/releases)
- [Commits](phpstan/phpstan-symfony@2.0.14...2.0.15)

---
updated-dependencies:
- dependency-name: phpstan/phpstan-symfony
  dependency-version: 2.0.15
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]