remove no longer required include related to use new parent_path

radicale/app/base.py

@@ -17,7 +17,6 @@
 
 import io
 import logging
-import posixpath
 import sys
 import xml.etree.ElementTree as ET
 from typing import Optional, Union

radicale/app/mkcalendar.py

@@ -19,7 +19,6 @@
 # along with Radicale.  If not, see <http://www.gnu.org/licenses/>.
 
 import errno
-import posixpath
 import re
 import socket
 from http import client

radicale/app/mkcol.py

@@ -19,7 +19,6 @@
 # along with Radicale.  If not, see <http://www.gnu.org/licenses/>.
 
 import errno
-import posixpath
 import re
 import socket
 from http import client