Bump validator from 0.14.0 to 0.15.0

Bumps [validator](https://github.com/Keats/validator) from 0.14.0 to 0.15.0.
- [Release notes](https://github.com/Keats/validator/releases)
- [Changelog](https://github.com/Keats/validator/blob/master/CHANGELOG.md)
- [Commits](https://github.com/Keats/validator/compare/v0.14.0...v0.15.0)

---
updated-dependencies:
- dependency-name: validator
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.toml

@@ -23,7 +23,7 @@ scheduled-thread-pool = "0.2.2"
 serde = "1.0"
 serde_json = "1.0.80"
 shrinkwraprs = "0.3.0"
-validator = { version = "0.14", features = ["derive"] }
+validator = { version = "0.15", features = ["derive"] }
 webfinger = "0.4.1"
 tracing = "0.1.34"
 tracing-subscriber = "0.3.10"