Update twig/twig requirement from 1.*@stable to 1.*@stable || 2.12
Update twig/twig requirement from 1.*@stable to 1.*@stable || 2.12

Updates the requirements on [twig/twig](https://github.com/twigphp/Twig) to permit the latest version.
- [Release notes](https://github.com/twigphp/Twig/releases)
- [Changelog](https://github.com/twigphp/Twig/blob/2.x/CHANGELOG)
- [Commits](https://github.com/twigphp/Twig/compare/v1.0.0...v2.12.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
neilime/geshi-twig-extension,neilime/geshi-twig-extension