fixup! PI: Don't load entire file into memory when passed file name

pypdf/_reader.py

@@ -346,7 +346,8 @@ def __init__(
         elif password is not None:
             raise PdfReadError("Not encrypted file")
 
-    def close(self):
+    def close(self) -> None:
+        """Close the underlying file handle"""
         self.stream.close()
 
     @property