minor symfony#2143 [Site] Update Twig 3.14 (smnandre)

This PR was merged into the 2.x branch.

Discussion
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[Site] Update Twig 3.14

See:  GHSA-6j75-5wfj-gh66

Commits
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80db4b2 [Site] Update Twig 3.14

Author: smnandre