Update dependency @google-cloud/pubsub to v6.2.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@google-cloud/pubsub (source)	6.1.0 → 6.2.0

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Release Notes

googleapis/google-cloud-node (@​google-cloud/pubsub)

v6.2.0

Features

• tools: Add individual CLI flags for Bun monkey patches (#​9533) (a5eec89)

Bug Fixes

• pubsub: Avoid invoking callback inside promise handler in getClient_ (#​9544) (752d1d7)
• pubsub: Pause underlying pull streams and skip keepalive teardown while paused (#​9521) (f863ecc)

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