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

Bumps [org.springframework.security:spring-security-bom](https://github.com/spring-projects/spring-security) from 5.8.12 to 6.4.2.
- [Release notes](https://github.com/spring-projects/spring-security/releases)
- [Changelog](https://github.com/spring-projects/spring-security/blob/main/RELEASE.adoc)
- [Commits](spring-projects/spring-security@5.8.12...6.4.2)

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

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

Author: dependabot[bot]

internal-spring-boot-2-bom/build.gradle.kts

@@ -17,7 +17,7 @@ dependencies {
     api(platform("org.springframework:spring-framework-bom:5.3.37"))
     api(platform("org.springframework.cloud:spring-cloud-dependencies:2021.0.9"))
     api(platform("org.springframework.cloud:spring-cloud-sleuth-otel-dependencies:1.1.4"))
-    api(platform("org.springframework.security:spring-security-bom:5.8.12"))
+    api(platform("org.springframework.security:spring-security-bom:6.4.2"))
 
     constraints {
         api("org.springframework.boot:spring-boot-gradle-plugin:$spring2Version")