deps(deps): update validator requirement from 0.20 to 0.21

[dependabot]

Updates the requirements on validator to permit the latest version.

Changelog

Sourced from validator's changelog.

0.21.0 (2026/07/09)

• Replace dep proc-macro-error2 with proc-macro-error3
• Edition 2024

0.20.0 (2025/01/20)

• Implement AsRegex for std::sync::LazyLock<Regex>
• Bug fix for nested issue with custom only running nested if outer passes
• Support Deserialize for ValidationErrors

0.19.0 (2024/11/03)

• Swap to using proc-macro-error-2 instead of proc-macro-error for Syn
• Bumped MSRV to 1.81 because of error naming changes.
• Add more ValidateRegex impl

0.18.1 (2024/04/11)

• Fix multiple custom validation
• Fix nested error handling

0.18.0 (2024/04/05)

• Fix regressions from the derive rewrite, some things are back to 0.16 (eg custom functions)
• Remove require_nested, use required and nested validators instead
• Always require nested on the field for nested validation

0.17.0 (2024/03/04)

• Derive macro has been entirely rewritten
• Validation is now done through traits that you can implement
• Remove phone validator
• Remove automatic use of serde rename for fields name (temporary)

0.16.0 (2022/06/27)

• Allow passing code/message to required
• Add does_not_contain validator
• Check email length before validating it

0.15.0 (2022/05/03)

• Allow passing args to schema validator
• Implement HasLen for map/set types
• Remove validator_types from validator crate
• Add ValidationErrors::errors_mut

... (truncated)

Commits

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