[tests.segmentation] Fix expected JSON filename

tests/segmentation/test_cxr8.py

@@ -30,7 +30,7 @@ def test_protocol_consistency(
     from mednet.libs.common.data.split import make_split
 
     database_checkers.check_split(
-        make_split("mednet.libs.segmentation.config.data.cxr8", f"{split}.json"),
+        make_split("mednet.libs.segmentation.config.data.cxr8", f"{split}.json.bz2"),
         lengths=lengths,
         prefixes=[],
         possible_labels=[],