fix(deps): update dependency symfony/var-exporter to v6

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	Change
symfony/var-exporter (source)	require	major	^5.0 -> ^6.0

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Release Notes

symfony/var-exporter

v6.0.0

Compare Source

Changelog (https://github.com/symfony/var-exporter/compare/v6.0.0-RC1...v6.0.0)

• no significant changes

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