chore: Update Composer dev dependencies to v8 (major)

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
symfony/cache (source)	^6.4||^7.0 -> 8.0.1
symfony/var-exporter (source)	^6.4||^7.0 -> 8.0.0

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Release Notes

symfony/cache (symfony/cache)

v8.0.1

Compare Source

Changelog (symfony/cache@v8.0.0...v8.0.1)

• bug symfony/symfony#62614 [Cache] Fix NullAdapter must set taggable (@​a.dmitryuk)
• bug symfony/symfony#62602 [Cache] Fix the creation of a redis connection with only ext-relay (@​stof)
• bug symfony/symfony#62543 [Cache] ensure compatibility with RelayCluster 0.20.0 (@​xabbuh)
• bug symfony/symfony#62536 [Cache] ensure compatibility with Relay extension 0.20.0 (@​xabbuh)

v8.0.0

Compare Source

symfony/var-exporter (symfony/var-exporter)

v8.0.0

Compare Source

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