TYP: fix type hint to accomodate BytesIO

Author: arw2019

pandas/core/frame.py

@@ -2288,7 +2288,7 @@ def to_markdown(
     @deprecate_kwarg(old_arg_name="fname", new_arg_name="path")
     def to_parquet(
         self,
-        path: Optional[FilePathOrBuffer[AnyStr]] = None,
+        path: Optional[FilePathOrBuffer] = None,
         engine: str = "auto",
         compression: Optional[str] = "snappy",
         index: Optional[bool] = None,

pandas/io/parquet.py

@@ -239,7 +239,7 @@ def read(
 
 def to_parquet(
     df: DataFrame,
-    path: Optional[FilePathOrBuffer[AnyStr]] = None,
+    path: Optional[FilePathOrBuffer] = None,
     engine: str = "auto",
     compression: Optional[str] = "snappy",
     index: Optional[bool] = None,