Bump org.springframework.security:spring-security-saml2-service-provider

Bumps [org.springframework.security:spring-security-saml2-service-provider](https://github.com/spring-projects/spring-security) from 6.4.1 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](https://github.com/spring-projects/spring-security/compare/6.4.1...6.4.2)

---
updated-dependencies:
- dependency-name: org.springframework.security:spring-security-saml2-service-provider
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle

@@ -22,7 +22,7 @@ ext {
     imageioVersion = "3.12.0"
     lombokVersion = "1.18.36"
     bouncycastleVersion = "1.79"
-    springSecuritySamlVersion = "6.4.1"
+    springSecuritySamlVersion = "6.4.2"
     openSamlVersion = "4.3.2"
 }