Build(deps): Bump symfony/flex from 2.4.6 to 2.4.7 (#2839)

Bumps [symfony/flex](https://github.com/symfony/flex) from 2.4.6 to 2.4.7.
- [Release notes](https://github.com/symfony/flex/releases)
- [Commits](symfony/flex@v2.4.6...v2.4.7)

---
updated-dependencies:
- dependency-name: symfony/flex
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>