chore(deps): update databend-driver requirement from 0.20.1 to 0.21.0

[dependabot[bot]]

Updates the requirements on databend-driver to permit the latest version.

Release notes

Sourced from databend-driver's releases.

v0.21.0

What's Changed

• fix: exit client if login failed with password wrong by @​b41sh in datafuselabs/bendsql#474
• chore(cli): bump ast to 0.0.3 by @​sundy-li in datafuselabs/bendsql#475
• chore(driver): test format_null_as_str with set by @​everpcpc in datafuselabs/bendsql#478
• chore(cli): display server's time as default by @​sundy-li in datafuselabs/bendsql#480

Full Changelog: https://github.com/datafuselabs/bendsql/compare/v0.20.1...v0.21.0

Commits

• a489772 chore(cli): display server's time as default (#480)
• 5c922c3 chore(driver): test format_null_as_str with set (#478)
• 0e13616 chore(cli): bump ast to 0.0.3 (#475)
• c2f7e60 fix: exit client if login failed with password wrong (#474)
• See full diff in compare view

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