Bump symfony/yaml from 3.4.18 to 3.4.19
Bump symfony/yaml from 3.4.18 to 3.4.19

Bumps [symfony/yaml](https://github.com/symfony/yaml) from 3.4.18 to 3.4.19.
- [Release notes](https://github.com/symfony/yaml/releases)
- [Changelog](https://github.com/symfony/yaml/blob/master/CHANGELOG.md)
- [Commits](https://github.com/symfony/yaml/compare/v3.4.18...v3.4.19)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
wirecard/paymentSDK-php,wirecard/paymentSDK-php