Bump org.springframework.security:spring-security-bom

Bumps [org.springframework.security:spring-security-bom](https://github.com/spring-projects/spring-security) from 6.1.7 to 6.1.9.
- [Release notes](https://github.com/spring-projects/spring-security/releases)
- [Changelog](https://github.com/spring-projects/spring-security/blob/main/RELEASE.adoc)
- [Commits](https://github.com/spring-projects/spring-security/compare/6.1.7...6.1.9)

---
updated-dependencies:
- dependency-name: org.springframework.security:spring-security-bom
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

gradle/libs.versions.toml

@@ -3,7 +3,7 @@ org-springframework-boot = "3.1.12"
 
 [libraries]
 org-springframework-spring-framework-bom = "org.springframework:spring-framework-bom:6.0.21"
-org-springframework-security-spring-security-bom = "org.springframework.security:spring-security-bom:6.1.7"
+org-springframework-security-spring-security-bom = "org.springframework.security:spring-security-bom:6.1.9"
 org-springframework-data-spring-data-bom = "org.springframework.data:spring-data-bom:2022.0.12"
 org-springframework-security-spring-security-oauth2-authorization-server = "org.springframework.security:spring-security-oauth2-authorization-server:1.0.4"