[Snyk] Security upgrade @google-cloud/pubsub from 0.8.0 to 0.15.0#238

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snyk-fix-c3b5fdcc51cd5b20b16800f50dccb1cf

Commits on Feb 13, 2020

fix: appengine/pubsub/package.json & appengine/pubsub/yarn.lock to reduce vulnerabilities
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