Bump doctrine/doctrine-migrations-bundle from 3.0.2 to 3.1.1 in /symfony

Bumps [doctrine/doctrine-migrations-bundle](https://github.com/doctrine/DoctrineMigrationsBundle) from 3.0.2 to 3.1.1.
- [Release notes](https://github.com/doctrine/DoctrineMigrationsBundle/releases)
- [Changelog](https://github.com/doctrine/DoctrineMigrationsBundle/blob/3.1.x/Changelog.md)
- [Commits](doctrine/DoctrineMigrationsBundle@3.0.2...3.1.1)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]