build(deps): bump cloud.google.com/go/pubsub from 1.17.0 to 1.21.0

[dependabot[bot]]

Bumps cloud.google.com/go/pubsub from 1.17.0 to 1.21.0.

Release notes

Sourced from cloud.google.com/go/pubsub's releases.

pubsub: v1.21.0

1.21.0 (2022-04-26)

Features

• pubsub: deprecate synchronous mode (#5910) (bda5179)

Bug Fixes

• pubsub: enable updating enable_exactly_once_delivery in fake pubsub (#5940) (ee44bf6)
• pubsub: nack messages properly with error from receive scheduler (#5909) (80edea4)

pubsub: v1.20.0

1.20.0 (2022-04-11)

Features

• pubsub/pstest: add topic retention support (#4790) (0a4ad6a)

Bug Fixes

• pubsub: ignore grpc errors in ack/modack (#5796) (4fb9aec)

pubsub: v1.19.0

1.19.0 (2022-03-07)

Features

• pubsub: add better version metadata to calls (d1ad921)
• pubsub: set versionClient to module version (55f0d92)

Bug Fixes

• pubsub: prevent infinite retry with publishing invalid utf-8 chars (#5728) (0a4dab9)
• pubsub: removing misspelled field, add correctly spelled field (4a223de)

Commits

• fe75f6b chore(main): release pubsub 1.21.0 (#5942)
• bda5179 feat(pubsub): deprecate synchronous mode (#5910)
• ee44bf6 fix(pubsub): enable updating enable_exactly_once_delivery in fake pubsub (#5940)
• 80edea4 fix(pubsub): nack messages properly with error from receive scheduler (#5909)
• 3a1a55a chore: show we support 1.18 (#5935)
• 022d320 chore(storage): implement ListObjects (#5918)
• c8711ee chore(storage): implement ListBuckets (#5908)
• 7b1173d chore(all): auto-regenerate gapics (#5930)
• f37584f chore: release main (#5928)
• d4ea7dd chore(all): auto-regenerate gapics (#5924)
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #415.