Bump doctrine/orm from 2.8.5 to 2.9.1 (#471)

Bumps [doctrine/orm](https://github.com/doctrine/orm) from 2.8.5 to 2.9.1.
- [Release notes](https://github.com/doctrine/orm/releases)
- [Commits](doctrine/orm@2.8.5...2.9.1)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>