Update files from the datasets library (from 1.5.0)

Release notes: https://github.com/huggingface/datasets/releases/tag/1.5.0

covost2.py

@@ -170,7 +170,7 @@ class Covost2(datasets.GeneratorBasedBuilder):
         )
 
         if split == "train":
-            df = df[(df["split"] == "train") | (df["split"] == f"train_covost")]
+            df = df[(df["split"] == "train") | (df["split"] == "train_covost")]
         else:
             df = df[df["split"] == split]