Fix local pdf loading (#7466)

fix local pdf loading

Author: lhoestq

src/datasets/features/pdf.py

@@ -164,8 +164,7 @@ def decode_example(self, value: dict, token_per_repo_id=None) -> "pdfplumber.pdf
                 raise ValueError(f"A pdf should have one of 'path' or 'bytes' but both are None in {value}.")
             else:
                 if is_local_path(path):
-                    with pdfplumber.open(path) as p:
-                        pdf = p
+                    pdf = pdfplumber.open(path)
                 else:
                     source_url = path.split("::")[-1]
                     pattern = (