Bump symfony/yaml from 4.2.3 to 4.2.4 in /src (#41)
Bump symfony/yaml from 4.2.3 to 4.2.4 in /src (#41)

Bumps [symfony/yaml](https://github.com/symfony/yaml) from 4.2.3 to 4.2.4.
- [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/v4.2.3...v4.2.4)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
md100play/AudioDidact,md100play/AudioDidact,md100play/AudioDidact