Switch to Jupiter JUnit for tests

build.gradle

@@ -53,7 +53,7 @@ allprojects {
     }
 
     project.ext {
-        junitVersion = 4.12
+        junitVersion = '5.7.0'
         androidBootClasspath = getAndroidRuntimeJar(pgpainlessMinAndroidSdk)
         rootConfigDir = new File(rootDir, 'config')
         gitCommit = getGitCommit()
@@ -92,6 +92,9 @@ allprojects {
         }
     }
 
+    test {
+        useJUnitPlatform()
+    }
 }
 
 subprojects {