Fix API (types are now lowercase :/)

Author: dfuchss

src/main/java/edu/kit/kastel/sdq/artemis4j/client/ProgrammingExerciseDTO.java

@@ -1,4 +1,4 @@
-/* Licensed under EPL-2.0 2024-2025. */
+/* Licensed under EPL-2.0 2024-2026. */
 package edu.kit.kastel.sdq.artemis4j.client;
 
 import java.time.ZonedDateTime;
@@ -27,7 +27,7 @@ public static List<ProgrammingExerciseDTO> fetchAll(ArtemisClient client, int co
                 .executeAndDecode(client, ExerciseWrapperDTO.class);
         // Remove all non-programming exercises
         return exercises.exercises().stream()
-                .filter(e -> e.exerciseType().equals("PROGRAMMING"))
+                .filter(e -> e.exerciseType().equalsIgnoreCase("programming"))
                 .toList();
     }
 

src/main/java/edu/kit/kastel/sdq/artemis4j/client/TextExerciseDTO.java

@@ -1,4 +1,4 @@
-/* Licensed under EPL-2.0 2024-2025. */
+/* Licensed under EPL-2.0 2024-2026. */
 package edu.kit.kastel.sdq.artemis4j.client;
 
 import java.time.ZonedDateTime;
@@ -33,7 +33,7 @@ public static List<TextExerciseDTO> fetchAll(ArtemisClient client, int courseId)
                 .executeAndDecode(client, ExerciseWrapperDTO.class);
         // Remove all non-text exercises
         return exercises.exercises().stream()
-                .filter(e -> e.exerciseType().equals("TEXT"))
+                .filter(e -> e.exerciseType().equalsIgnoreCase("text"))
                 .toList();
     }