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

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
google-cloud-pubsub	major	==1.7.0 -> ==2.2.0

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Release Notes

googleapis/python-pubsub

v2.2.0

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Features

• Add dead lettering max delivery attempts argument (#​236) (7687ae5)
• Enable server side flow control by default with the option to turn it off (#​231) (94d738c)

Bug Fixes

• fix mtls issue in handwritten layer (#​226) (09a409c)
• make fixup script consistent with migration docs (#​208) (b64e218)

Documentation

• document potentially unexpected blocking behavior of publish() method (#​214) (b6d9bd7)
• fix get topic_path in subscriber sample (#​210) (7228f6c)

v2.1.0

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09-21-2020 02:19 PDT

Implementation Changes

• Convert all RPC error types to exceptions. (#​163) (#​170)
• Pass client options to publisher and subscriber clients. (#​166) (#​190)

New Features

• Regenerate the client lib to pick new mtls env (via synth). (#​197)

Documentation

• Add subscription detachment sample. (#​152)
• Use new call syntax in subscriber docs. (#​198) (#​203)

Internal / Testing Changes

• Update CODEOWNERS. (#​193)

v2.0.0

Compare Source

09-11-2020 05:03 PDT

Implementation Changes

• Transition the library to microgenerator. (#​158)
  This is a breaking change that introduces several method signature changes and drops support
  for Python 2.7 and 3.5.

Documentation

• Add samples for using ordering keys. (#​156)
• Remove extra white space in delivery attempt sample. (#​159)

Internal / Testing Changes

• Fix flaky sequencer unit tests. (#​187)

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