Bump symfony/cache from 4.3.4 to 4.3.8 in /Laravel

[dependabot[bot]]

Bumps symfony/cache from 4.3.4 to 4.3.8.

Commits

• 83dca34 Merge branch '3.4' into 4.3
• 8d5db9c security #cve-2019-18889 [Cache] forbid serializing AbstractAdapter and TagAw...
• 30a51b2 [4.3] Remove unused local variables
• 08b664a Merge branch '3.4' into 4.3
• 9307cc1 Remove unused local variables in tests
• 5ed3b21 Merge branch '3.4' into 4.3
• d2da3dc fix PHP 5.6 compatibility
• 6aed873 [Cache] fixed TagAwareAdapter returning invalid cache
• f3b0375 Merge branch '3.4' into 4.3
• fcc48d9 SCA: added missing break in a loop
• Additional commits viewable in compare view

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