Install security updates
Install security updates

Symfony and Twig have been updated to be hardened against the recently
reported vulnerabilities in said packabes.

* CVE-2019-10909: Escape validation messages in the PHP templating
  engine
* CVE-2019-10910: Check service IDs are valid
* CVE-2019-10911: Add a separator in the remember me cookie hash
* CVE-2019-10912: Prevent destructors with side-effects from being
  unserialized
* CVE-2019-10913: Reject invalid HTTP method overrides

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