file-store: remove deprecated PathLib2

rhodecode/apps/file_store/utils.py

@@ -20,7 +20,7 b''
 
 import io
 import uuid
-import pathlib2
+import pathlib
 
 
 def get_file_storage(settings):
@@ -31,7 +31,7 b' def get_file_storage(settings):'
 
 
 def splitext(filename):
-    ext = ''.join(pathlib2.Path(filename).suffixes)
+    ext = ''.join(pathlib.Path(filename).suffixes)
     return filename, ext