Use Version (packaging) instead of StrictVersion (distutils)

This PR removes the Deprectation Warning found when running tests:

DeprecationWarning: distutils Version classes are deprecated. Use packaging.version instead.
hiredis_version = StrictVersion(hiredis.__version__)

I just wanted to get rid of it. :)

What do these changes do?

[ ] I think the code is well written
[ ] Unit tests for the changes exist
[ ] Documentation reflects the changes
[ ] If you provide code modification, please add yourself to CONTRIBUTORS.txt
- The format is <Name> <Surname>.
- Please keep alphabetical order, the file is sorted by names.
[ ] Add a new news fragment into the CHANGES/ folder
- name it <issue_id>.<type> (e.g. 588.bugfix)
- if you don't have an issue_id change it to the pr id after creating the PR
- ensure type is one of the following:
- .feature: Signifying a new feature.
- .bugfix: Signifying a bug fix.
- .doc: Signifying a documentation improvement.
- .removal: Signifying a deprecation or removal of public API.
- .misc: A ticket has been closed, but it is not of interest to users.
- Make sure to use full sentences with correct case and punctuation, for example: Fix issue with non-ascii contents in doctest text files.