Log Message:
py-fakefs: updated to 5.5.0

Version 5.5.0
Deprecates the usage of `pathlib2` and `scandir`.

Changes
* The usage of the `pathlib2` and `scandir` modules in pyfakefs is now deprecated.
  They will now cause deprecation warnings if still used. Support for patching
  these modules will be removed in pyfakefs 6.0.
* `PureWindowsPath` and `PurePosixPath` now use filesystem-independent path \ 
separators,
  and their path-parsing behaviors are now consistent regardless of runtime platform
  and/or faked filesystem customization.

Fixes
* fixed handling of Windows `pathlib` paths under POSIX and vice verse
* correctly use real open calls in pathlib for skipped modules