Update dependency google-cloud-pubsub to v0.45.0

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
google-cloud-pubsub	==0.42.1 -> ==0.45.0

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Release Notes

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

v0.45.0

Compare Source

07-31-2019 02:03 PDT

Implementation Changes

• Remove deprecated methods and settings (#​8836)

Documentation

• Use double backticks for ReST correctness. (#​8829)
• Update intersphinx mapping for requests. (#​8805)

v0.44.0

Compare Source

07-29-2019 04:28 PDT

Implementation Changes

• PubSub: Deprecate several FlowControl settings and things in Message class (#​8796)

Documentation

• Pub/Sub: document regional endpoint (#​8789)

v0.43.0

Compare Source

07-24-2019 17:13 PDT

Implementation Changes

• Accomodate new location of 'IAMPolicyStub' (via synth). (#​8680)
• Use kwargs in test_subscriber_client (#​8414)

New Features

• Add options_ argument to clients' get_iam_policy; pin black version (via synth). (#​8657)
• Add 'client_options' support, update list method docstrings (via synth). (#​8518)

Dependencies

• Bump minimum version for google-api-core to 1.14.0. (#​8709)
• Update pin for 'grpc-google-iam-v1' to 0.12.3+. (#​8647)

Documentation

• Link to googleapis.dev documentation in READMEs. (#​8705)
• Add compatibility check badges to READMEs. (#​8288)
• Fix typo in publisher index. (#​8619)
• Document how to choose the PubSub auth method (#​8429)
• Document different PuSub received message types (#​8468)
• PubSub: Document batch settings, make synth operations idempotent (#​8448)
• Add custom docstrings for FlowControl enum and values (via synth). (#​8426)

Internal / Testing Changes

• Add docs job to publish to googleapis.dev. (#​8464)
• Add system tests for PubSub clients (#​8277)

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[chrislovecnm]

test this please