Bump symfony/var-dumper in the composer group across 1 directory

Bumps the composer group with 1 update in the / directory: [symfony/var-dumper](https://github.com/symfony/var-dumper).


Updates `symfony/var-dumper` from 6.2.8 to 6.4.4
- [Release notes](https://github.com/symfony/var-dumper/releases)
- [Changelog](https://github.com/symfony/var-dumper/blob/7.2/CHANGELOG.md)
- [Commits](symfony/var-dumper@v6.2.8...v6.4.4)

---
updated-dependencies:
- dependency-name: symfony/var-dumper
  dependency-type: direct:development
  dependency-group: composer
...

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