Update dependency org.junit.jupiter:junit-jupiter to v5.12.0

Author: renovate[bot]

algorithm-exercises-java/build.gradle

@@ -24,7 +24,7 @@ repositories {
 
 dependencies {
     // Use JUnit Jupiter for testing.
-    testImplementation 'org.junit.jupiter:junit-jupiter:5.11.4'
+    testImplementation 'org.junit.jupiter:junit-jupiter:5.12.0'
     testRuntimeOnly("org.junit.platform:junit-platform-launcher")
 
     // This dependency is used by the application.