Bump org.mockito:mockito-bom from 5.15.2 to 5.16.0

Bumps [org.mockito:mockito-bom](https://github.com/mockito/mockito) from 5.15.2 to 5.16.0.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](https://github.com/mockito/mockito/compare/v5.15.2...v5.16.0)

---
updated-dependencies:
- dependency-name: org.mockito:mockito-bom
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

gradle/libs.versions.toml

@@ -11,7 +11,7 @@ org-bouncycastle = "1.80"
 org-eclipse-jetty = "11.0.24"
 org-jetbrains-kotlin = "1.9.25"
 org-jetbrains-kotlinx = "1.10.1"
-org-mockito = "5.15.2"
+org-mockito = "5.16.0"
 org-opensaml = "4.3.2"
 org-opensaml5 = "5.1.2"
 org-springframework = "6.2.3"