chore(deps): bump cloud.google.com/go/storage from 1.20.0 to 1.21.0

Created by: dependabot[bot]

Bumps cloud.google.com/go/storage from 1.20.0 to 1.21.0.

Release notes

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

storage: v1.21.0

1.21.0 (2022-02-17)

Features

• storage: add better version metadata to calls (#5507) (13fe0bc), refs #2749
• storage: add Writer.ChunkRetryDeadline (#5482) (498a746)

Commits

• 6c7925e chore: release spanner 1.21.0 (#4284)
• 6fffd3b chore: release pubsublite 0.10.1 (#4300)
• 5b5d0f7 fix(pubsublite): make SubscriberClient.Receive identical to pubsub (#4281)
• 634847b fix(pubsublite): fixes for background partition count updates (#4293)
• 598f5b9 feat(internal/godocfx): different metadata for different modules (#4297)
• 37607b4 feat(bigquery): add support for user defined TVF (#4043)
• 4c12b42 feat(bigquery): add support for snapshot/restore (#4112)
• 83337b8 chore(internal/godocfx): add binary to .gitignore (#4296)
• d52bae6 feat(internal/godocfx): add support for other modules (#4290)
• 4550c9e chore(all): update all (#4289)
• Additional commits viewable in compare view

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