Update twig/twig requirement from ~2.14.8 to ~3.8.0

Updates the requirements on [twig/twig](https://github.com/twigphp/Twig) to permit the latest version.
- [Changelog](https://github.com/twigphp/Twig/blob/3.x/CHANGELOG)
- [Commits](twigphp/Twig@v2.14.8...v3.8.0)

---
updated-dependencies:
- dependency-name: twig/twig
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

composer.json

@@ -8,7 +8,7 @@
     "require": {
         "php"           : "^7.2 || ^8.0",
         "sabre/dav"     : "~4.5.0",
-        "twig/twig"     : "~2.14.8",
+        "twig/twig"     : "~3.8.0",
         "symfony/yaml"  : "^3.4",
         "psr/log"       : "^1",
         "ext-dom"       : "*",