Update dependency org.mockito:mockito-core to v5.21.0 (#262)

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

Author: renovate[bot]

gradle/libs.versions.toml

@@ -65,7 +65,7 @@ junit-jupiter-api = { module = "org.junit.jupiter:junit-jupiter-api", version.re
 junit-jupiter-engine = { module = "org.junit.jupiter:junit-jupiter-engine", version.ref = "junit" }
 junit-platform-launcher = { module = "org.junit.platform:junit-platform-launcher", version = "6.0.1" }
 
-mockito = "org.mockito:mockito-core:5.20.0"
+mockito = "org.mockito:mockito-core:5.21.0"
 mockito-kotlin = "org.mockito.kotlin:mockito-kotlin:6.1.0"
 
 [bundles]