[TwigBridge] Update min. version of Twig

| Q             | A
| ------------- | ---
| Bug fix?      | kinda
| New feature?  | no
| BC breaks?    | no
| Tests pass?   | yes
| License       | MIT

The minimal version of Twig must be 1.12 because of usage the method `Twig_SimpleFunction` that was added in that version.