Bump phpstan/phpstan-symfony from 1.2.23 to 1.3.4

Bumps [phpstan/phpstan-symfony](https://github.com/phpstan/phpstan-symfony) from 1.2.23 to 1.3.4.
- [Release notes](https://github.com/phpstan/phpstan-symfony/releases)
- [Commits](phpstan/phpstan-symfony@1.2.23...1.3.4)

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

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