Update dependency org.mockito:mockito-core to v3.4.6 (#250)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

build.gradle.kts

@@ -45,7 +45,7 @@ subprojects {
         // Testing (JUnit, Mockito, etc)
         testImplementation("org.junit.jupiter:junit-jupiter:5.6.2")
         testImplementation("org.mockito:mockito-junit-jupiter:3.4.6")
-        testImplementation("org.mockito:mockito-core:3.4.4")
+        testImplementation("org.mockito:mockito-core:3.4.6")
         testImplementation("org.hamcrest:hamcrest:2.2")
         testImplementation("org.assertj:assertj-core:3.16.1")