Replace YAML keys from int to str

Replace YAML metadata integer keys with strings, as the Hub does not support integers.
See: https://github.com/huggingface/datasets/issues/5275

README.md

@@ -16,7 +16,6 @@ source_datasets:
 task_categories:
 - summarization
 task_ids: []
-paperswithcode_id: null
 pretty_name: XSum Hallucination Annotations
 tags:
 - hallucinations
@@ -33,8 +32,8 @@ dataset_info:
     dtype:
       class_label:
         names:
-          0: 'no'
-          1: 'yes'
+          '0': 'no'
+          '1': 'yes'
   - name: worker_id
     dtype: string
   splits:
@@ -55,8 +54,8 @@ dataset_info:
     dtype:
       class_label:
         names:
-          0: intrinsic
-          1: extrinsic
+          '0': intrinsic
+          '1': extrinsic
   - name: hallucinated_span_start
     dtype: int32
   - name: hallucinated_span_end