OZG-6944 fix itcase

vorgang-manager-server/src/test/java/de/ozgcloud/nachrichten/antragraum/AntragraumITCase.java

@@ -376,12 +376,11 @@ class AntragraumITCase {
 		private static final String SAML_TOKEN = TestUtils.loadTextFile("SamlResponse.xml");
 
 		@Mock
-		private StreamObserver<GrpcGetAttachmentContentResponse> responseObserver;
+		private CallStreamObserver<GrpcGetAttachmentContentResponse> responseObserver;
 
 		@Captor
 		private ArgumentCaptor<GrpcGetAttachmentContentResponse> captor;
 
-		private Vorgang savedVorgang;
 		private VorgangAttachedItem vorgangAttachedItem;
 		private VorgangAttachedItem vorgangAttachedItemDifferentAttachment;
 		private String fileId;
@@ -389,7 +388,7 @@ class AntragraumITCase {
 		@BeforeEach
 		void prepareDatabase() {
 			fileId = gridFsTemplate.store(GridFsTestFactory.createUpload()).toString();
-			savedVorgang = mongoOperations.save(createVorgang(TrustLevel.LEVEL_3), Vorgang.COLLECTION_NAME);
+			var savedVorgang = mongoOperations.save(createVorgang(TrustLevel.LEVEL_3), Vorgang.COLLECTION_NAME);
 			vorgangAttachedItem = mongoOperations.save(createPostfachNachrichtVorgangAttachedItem(savedVorgang.getId(), fileId),
 					VorgangAttachedItem.COLLECTION_NAME);
 			vorgangAttachedItemDifferentAttachment = mongoOperations.save(createPostfachNachrichtVorgangAttachedItem(savedVorgang.getId()),