fix: replace print with println

Author: Elscrux

src/test/java/edu/kit/provideq/toolbox/api/ApiTestHelper.java

@@ -200,7 +200,7 @@ public static <InputT, ResultT> ProblemDto<InputT, ResultT> trySolveFor(
       }
 
       if (hasTimeout.get()) {
-        System.out.print("Stopping testcase due to timeout.");
+        System.out.println("Stopping testcase due to timeout.");
         System.out.println("log: " + builder);
         throw new IllegalStateException("Problem did not solve in time: " + problemDto);
       }