Do not fail to remove temporary files at exit

On Windows PermissionError may be raised.

Closes #13308

tryton/tryton/common/tempfile.py

@@ -25,7 +25,7 @@ def clean():
     for fname in _files:
         try:
             os.remove(fname)
-        except FileNotFoundError:
+        except (FileNotFoundError, PermissionError):
             pass
     _files.clear()