Bump symfony/flex from 2.8.1 to 2.8.2 (#355)

Bumps [symfony/flex](https://github.com/symfony/flex) from 2.8.1 to 2.8.2.
- [Release notes](https://github.com/symfony/flex/releases)
- [Commits](symfony/flex@v2.8.1...v2.8.2)

---
updated-dependencies:
- dependency-name: symfony/flex
  dependency-version: 2.8.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]