chore(deps): bump cloud.google.com/go/storage from 1.19.0 to 1.20.0

Created by: dependabot[bot]

Bumps cloud.google.com/go/storage from 1.19.0 to 1.20.0.

Release notes

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

storage storage/v1.20.0

Features

• storage/internal: Update definition of RewriteObjectRequest to bring to parity with JSON API support (#5447) (7d175ef)

Commits

• 445b003 chore: release spanner 1.20.0 (#4230)
• 29c7247 feat(spanner): add the support of optimizer statistics package (#2717)
• 980126a chore: release pubsublite 0.9.0 (#4038)
• fb2cd04 refactor(pubsublite): remove async ack processing (#4189)
• 9e80ea0 chore(all): auto-regenerate gapics (#4222)
• fbb3b8e chore(all): update all (#4224)
• 2095028 fix(bigtable/bttest): fix ModifyColumnFamilies to purge data (#4096)
• fc6f86e test(bigtable): randomize table names to assist in simultaneous test runs (#4...
• 6226c87 chore(all): auto-regenerate gapics (#4214)
• be1d729 chore: bulk gen (#4213)
• Additional commits viewable in compare view

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