Bump symfony/flex from 1.0.71 to 1.0.75
Bump symfony/flex from 1.0.71 to 1.0.75

Bumps [symfony/flex](https://github.com/symfony/flex) from 1.0.71 to 1.0.75.
- [Release notes](https://github.com/symfony/flex/releases)
- [Commits](https://github.com/symfony/flex/compare/v1.0.71...v1.0.75)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
alcohol/paste.robbast.nl,alcohol/paste.robbast.nl,alcohol/sf-minimal-demo,alcohol/paste.robbast.nl