Update symfony packages

This MR contains the following updates:

Package	Type	Update	Change
symfony/flex	require	patch	2.3.1 -> 2.3.3
symfony/yaml (source)	require	patch	6.3.0 -> 6.3.3

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Release Notes

symfony/flex (symfony/flex)

v2.3.3

Compare Source

v2.3.2

Compare Source

symfony/yaml (symfony/yaml)

v6.3.3

Compare Source

Changelog (https://github.com/symfony/yaml/compare/v6.3.2...v6.3.3)

• no significant changes

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