fix(@aws-amplify/api-graphql): Add missing @aws-amplify/pubsub dependency

[ericclemmons]

When running yarn build locally, I identified a race-condition where @aws-amplify/api-graphql's build was failing due to @aws-amplify/pubsub not being built yet.

This has come up in the past, and the solution is simple: explicitly add dependencies to package.json:

amplify-js/packages/api-graphql/src/GraphQLAPI.ts

Line 25 in 27355a4

import PubSub from '@aws-amplify/pubsub';

Missing @aws-amplify/pubsub:

amplify-js/packages/api-graphql/package.json

Lines 38 to 46 in 27355a4

	"dependencies": {
	"@aws-amplify/api-rest": "^1.0.8",
	"@aws-amplify/auth": "^3.2.3",
	"@aws-amplify/cache": "^3.1.6",
	"@aws-amplify/core": "^3.2.3",
	"graphql": "14.0.0",
	"uuid": "^3.2.1",
	"zen-observable-ts": "0.8.19"
	},

With this change, lerna's topological sort correctly build @aws-amplify/pubsub before @aws-amplify/api-graphql.

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Merging #5352 into master will not change coverage by %.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #5352   +/-   ##
=======================================
  Coverage   72.90%   72.90%           
=======================================
  Files         195      195           
  Lines       11466    11466           
  Branches     2234     2234           
=======================================
  Hits         8359     8359           
  Misses       2937     2937           
  Partials      170      170           

Impacted Files	Coverage Δ
packages/core/src/Platform/version.ts	100.00% <100.00%> (ø)

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[Amplifiyer]

LGTM 🚢 it

[github-actions]

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