Bump symfony/symfony from 4.4.50 to 4.4.51

Bumps [symfony/symfony](https://github.com/symfony/symfony) from 4.4.50 to 4.4.51.
- [Release notes](https://github.com/symfony/symfony/releases)
- [Changelog](https://github.com/symfony/symfony/blob/v4.4.51/CHANGELOG-4.4.md)
- [Commits](symfony/symfony@v4.4.50...v4.4.51)

---
updated-dependencies:
- dependency-name: symfony/symfony
  dependency-type: indirect
...

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