Update JUnit dependency

Updated from 5.5.2 to 5.6.0-M1.

Author: HenryssonDaniel

build.gradle

@@ -58,8 +58,8 @@ configurations {
 
 dependencies {
  implementation 'org.assertj:assertj-core:3.14.0'
- implementation 'org.junit.jupiter:junit-jupiter-engine:5.5.2'
- implementation 'org.junit.platform:junit-platform-launcher:1.5.2'
+ implementation 'org.junit.jupiter:junit-jupiter-engine:5.6.0-M1'
+ implementation 'org.junit.platform:junit-platform-launcher:1.6.0-M1'
  testImplementation 'org.mockito:mockito-core:3.1.0'
 }