[SECURITY] Conflict insecure versions symfony/cache component

The symfony/cache component is not directly used by the core but
is a dependency of symfony/expression-language which is used in
the core.

The affected symfony/cache packages have been marked as
"conflict" in the composer.json.

See https://symfony.com/blog/cve-2019-10912-prevent-destructors-with-side-effects-from-being-unserialized

Resolves: #88215
Releases: master, 9.5
Security-Commit: d13c36e9e9951030a0787c63674634a52ff0aae3
Security-Bulletin: TYPO3-CORE-SA-2019-016
Change-Id: If98391ceef88561507d0095d26455a8da128f01e
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/61142


Tested-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>