fix(deps): update dependency symfony/flex to v2.4.7

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
symfony/flex	2.4.6 -> 2.4.7

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Release Notes

symfony/flex (symfony/flex)

### [`v2.4.7`](https://redirect.github.com/symfony/flex/compare/v2.4.6...v2.4.7) [Compare Source](https://redirect.github.com/symfony/flex/compare/v2.4.6...v2.4.7)

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