chore: use public Http::setContext() in graphql resolver

setContext() is now public on Http (utopia-php/http#251). The graphql
resolver no longer needs to reach into the per-request container
directly to swap the active match for nested resolution — it can just
ask Http to do it.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/Appwrite/GraphQL/Resolvers.php

@@ -403,8 +403,7 @@ class Resolvers
             return;
         } finally {
             if ($original !== null) {
-                $container = self::getResolverContainer($utopia);
-                $container->set('match', static fn () => $original);
+                $utopia->setContext('match', static fn () => $original);
             }
 
             $lock->release();