[Security] Bump doctrine/orm from 2.4.2 to 2.4.8

Bumps [doctrine/orm](https://github.com/doctrine/doctrine2) from 2.4.2 to 2.4.8. **This update includes a security fix.**
- [Release notes](https://github.com/doctrine/doctrine2/releases)
- [Commits](doctrine/orm@v2.4.2...v2.4.8)

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