fix(deps): update dependency google/cloud-pubsub to v2

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
google/cloud-pubsub	^1.16 -> ^2.0

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Release Notes

googleapis/google-cloud-php-pubsub (google/cloud-pubsub)

v2.5.1: google/cloud-pubsub v2.5.1

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Bug Fixes

• docs: Misc reference fixes (#​7613) (81bed09)

v2.5.0: google/cloud-pubsub v2.5.0

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Features

• Add max messages batching for Cloud Storage subscriptions (b506231)

v2.4.0: google/cloud-pubsub v2.4.0

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⚠ BREAKING CHANGES

• PubSub: Remove accidentally added client classes (#​7494)

Chores

• PubSub: Remove accidentally added client classes (#​7494) (79fa25d)

v2.3.0: google/cloud-pubsub v2.3.0

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Features

• Add use_topic_schema for Cloud Storage Subscriptions (#​7448) (634b673)

v2.2.1: google/cloud-pubsub v2.2.1

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Bug Fixes

• Pubsub version constant (#​7362) (ffcadde)

v2.2.0: google/cloud-pubsub v2.2.0

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Features

• Add service_account_email for export subscriptions (#​7353) (f86b038)

v2.1.2: google/cloud-pubsub v2.1.2

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Miscellaneous Chores

v2.1.1: google/cloud-pubsub v2.1.1

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Miscellaneous Chores

v2.1.0: google/cloud-pubsub v2.1.0

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Features

• Add custom datetime format for Cloud Storage subscriptions (#​7181) (9d9ecd3)

v2.0.0: google/cloud-pubsub v2.0.0

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• Release PubSub V2

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