Update dependency org.mockito:mockito-bom to v5.21.0 (#3402)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

gradle/libs.versions.toml

@@ -47,7 +47,7 @@ text = "3.0.4"
 piston = "0.5.10"
 
 # Tests
-mockito = "5.20.0"
+mockito = "5.21.0"
 junit = "6.0.1"
 
 # Gradle plugins