Bump symfony/mime from 4.3.5 to 4.4.1

Bumps [symfony/mime](https://github.com/symfony/mime) from 4.3.5 to 4.4.1.
- [Release notes](https://github.com/symfony/mime/releases)
- [Changelog](https://github.com/symfony/mime/blob/master/CHANGELOG.md)
- [Commits](https://github.com/symfony/mime/compare/v4.3.5...v4.4.1

)

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