Bump symfony/var-dumper from 6.4.3 to 6.4.15

Bumps [symfony/var-dumper](https://github.com/symfony/var-dumper) from 6.4.3 to 6.4.15.
- [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@v6.4.3...v6.4.15)

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

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