Bump symfony/class-loader from 3.4.43 to 3.4.44
Bump symfony/class-loader from 3.4.43 to 3.4.44

Bumps [symfony/class-loader](https://github.com/symfony/class-loader) from 3.4.43 to 3.4.44.
- [Release notes](https://github.com/symfony/class-loader/releases)
- [Changelog](https://github.com/symfony/class-loader/blob/master/CHANGELOG.md)
- [Commits](https://github.com/symfony/class-loader/compare/v3.4.43...v3.4.44)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
sonata-project/sandbox,sonata-project/sandbox,sonata-project/sandbox