Remove inspect.Parameter compatibility

jedi/api/completion.py

@@ -1,12 +1,12 @@
 import re
 from textwrap import dedent
+from inspect import Parameter
 
 from parso.python.token import PythonTokenTypes
 from parso.python import tree
 from parso.tree import search_ancestor, Leaf
 from parso import split_lines
 
-from jedi._compatibility import Parameter
 from jedi import debug
 from jedi import settings
 from jedi.api import classes