Bump org.hibernate.validator:hibernate-validator

Bumps [org.hibernate.validator:hibernate-validator](https://github.com/hibernate/hibernate-validator) from 8.0.2.Final to 9.1.0.Final.
- [Release notes](https://github.com/hibernate/hibernate-validator/releases)
- [Changelog](https://github.com/hibernate/hibernate-validator/blob/main/changelog.txt)
- [Commits](hibernate/hibernate-validator@8.0.2.Final...9.1.0.Final)

---
updated-dependencies:
- dependency-name: org.hibernate.validator:hibernate-validator
  dependency-version: 9.1.0.Final
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

build.gradle

@@ -72,7 +72,7 @@ dependencies {
     testImplementation 'org.springframework.security:spring-security-test'
     testImplementation 'org.springframework.retry:spring-retry:2.0.12'
     testImplementation 'jakarta.validation:jakarta.validation-api:3.1.1'
-    testImplementation 'org.hibernate.validator:hibernate-validator:8.0.2.Final'
+    testImplementation 'org.hibernate.validator:hibernate-validator:9.1.0.Final'
     testImplementation 'com.h2database:h2:2.4.240'
 
     // Spring Boot 4 test starters (modular test infrastructure)