Fix Apollo Server 5 and graphql-subscriptions 3 compatibility

[Copilot]

Apollo Server 5 moved Express integration to separate packages, and graphql-subscriptions 3 renamed asyncIterator to asyncIterableIterator.

Changes:

• Added @as-integrations/express5@1.1.2 dependency (Apollo Server 5 no longer includes Express middleware)
• Updated import: @apollo/server/express4 → @as-integrations/express5
• Replaced pubsub.asyncIterator() with pubsub.asyncIterableIterator() in server and test helper

Example:

// Before
import { expressMiddleware } from '@apollo/server/express4';
return pubsub.asyncIterator('streamHero');

// After
import { expressMiddleware } from '@as-integrations/express5';
return pubsub.asyncIterableIterator('streamHero');

Files modified:

• examples/graphql/package.json
• examples/graphql/server/index.js
• test/helper/graphql-server.ts

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