Update import for useServer for graphql-ws v.6

[JordanHoffman]

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Updating the import statement to work with v.6 of graphql-ws per their instructions here: migrating v5 to v6

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* (developer-tools)/apollo-server/(latest)/data/subscriptions.mdx

Build ID: fb2763714254656004d8d417

URL: https://www.apollographql.com/docs/deploy-preview/fb2763714254656004d8d417

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[glasser]

Duplicate of #8087 (which admittedly came later :) ). My comment there applies here too.