Bump cloud.google.com/go/storage from 1.15.0 to 1.16.0

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

bigquery/v1.16.0

• Updates to various dependencies.

spanner spanner/v1.16.0

Features

• spanner: add optimizer_statistics_package field in QueryOptions (18c88c4)
• spanner/admin/database: add CMEK fields to backup and database (16597fa)

Bug Fixes

• spanner/spansql: fix parsing of NOT IN operator (#3724) (7636478)

storage storage/v1.16.0

Features

• storage: support PublicAccessPrevention (#3608) (99bc782), refs #3203

Bug Fixes

• storage: fix Writer.ChunkSize validation (#4255) (69c2e9d), refs #4167
• storage: try to reopen for failed Reads (#4226) (564102b), refs #3040

• 2c29789 chore: release spanner 1.16.0 (#3786)
• f96a3fa chore(all): auto-regenerate gapics (#3830)
• b7d1de9 bttest: deal with non-ASCII characters in regex (#3776)
• f9d3d85 chore: fix appengine service config (#3829)
• d8689f1 fix(pubsublite): fix committer races (#3810)
• 4188b73 chore(internal/kokoro): port check_incompat_changes (#3769)
• 6e49f21 feat(internal/godocfx): add prettyprint class to code blocks (#3819)
• df28999 fix(pubsublite): increase default timeouts for publish and subscribe stream c...
• fd04a55 chore(all): auto-regenerate gapics (#3817)
• 56d5d0a feat(internal/godocfx): handle Markdown content (#3816)
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