Bump symfony/flex from 2.0.1 to 2.1.2
Bump symfony/flex from 2.0.1 to 2.1.2

Bumps [symfony/flex](https://github.com/symfony/flex) from 2.0.1 to 2.1.2.
- [Release notes](https://github.com/symfony/flex/releases)
- [Commits](https://github.com/symfony/flex/compare/v2.0.1...v2.1.2)

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

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
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