Bump symfony/flex from 1.9.1 to 1.9.10
Bump symfony/flex from 1.9.1 to 1.9.10

Bumps [symfony/flex](https://github.com/symfony/flex) from 1.9.1 to 1.9.10.
- [Release notes](https://github.com/symfony/flex/releases)
- [Commits](https://github.com/symfony/flex/compare/v1.9.1...v1.9.10)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
trellis-ldp/static-ldp,trellis-ldp/static-ldp