chore: update dependency graphql-subscriptions to v3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
graphql-subscriptions	^2.0.0 -> ^3.0.0

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Release Notes

apollographql/graphql-subscriptions (graphql-subscriptions)

v3.0.0

Compare Source

• [BREAKING] Replace iterall use with native Symbol.asyncIterator. PubSubEngine.asyncIterator is now PubSubEngine.asyncIterableIterator.
  
  @​n1ru4l in #​232
• Add an optional generic type map to PubSub.
  
  @​cursorsdottsx in #​245
• Support readonly arrays of event names.
  
  @​rh389 in #​234
• Support returning a Promise of an AsyncIterator as the withFilter resolver function.
  
  @​maclockard in #​220
• withFilter TypeScript improvements.
  
  @​HofmannZ in #​230
• withFilter returns AsyncIterableIterator for compatibility with Apollo Server subscriptions.
  
  @​tninesling in #​276

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