chore(deps): bump symfony/var-dumper from 7.0.0 to 7.2.0 in /demo

Bumps [symfony/var-dumper](https://github.com/symfony/var-dumper) from 7.0.0 to 7.2.0.
- [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@v7.0.0...v7.2.0)

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

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Author: dependabot[bot]