fix(deps): update dependency symfony/flex to v2.4.6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
symfony/flex	2.4.5 -> 2.4.6

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Release Notes

symfony/flex (symfony/flex)

### [`v2.4.6`](https://togithub.com/symfony/flex/compare/v2.4.5...v2.4.6) [Compare Source](https://togithub.com/symfony/flex/compare/v2.4.5...v2.4.6)

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