Bump twig so we have a stable api

the formatDate function was a global function, and a static method in
previous points in time. This might not be the most stable API to couple
to, but we'll see how it goes. The alternative would be to duplicate the
twig filter code into our extensions.

composer.json

@@ -25,7 +25,7 @@
         "cakephp/cakephp": "^5.0.0",
         "jasny/twig-extensions": "^1.3",
         "twig/markdown-extra": "^3.0",
-        "twig/twig": "^3.4"
+        "twig/twig": "^3.10.3"
     },
     "require-dev": {
         "cakephp/cakephp-codesniffer": "^5.0",