ScanIso Timezone Removal

[phutelmyer]

Describe the change
As ISO files do not store timezone data, including a Zulu time (Z) in times is not completely accurate and may lead to incorrect assumptions about file times.

• Removing Zulu reference from times from ScanIso
• Updating ScanIso tests to reflect change
• Formatting ScanIso with black

Describe testing procedures
Executed pytest -s src/python/strelka/tests/test_scan_iso.py

(virtualenv) desktop:strelka test$ pytest -s src/python/strelka/tests/test_scan_iso.py 
==================================================================================================================================== test session starts =====================================================================================================================================
platform darwin -- Python 3.10.9, pytest-7.2.0, pluggy-1.0.0
rootdir: /Users/test/Desktop/GitHub/strelka/src/python
plugins: unordered-0.5.2, mock-3.10.0
collected 1 item                                                                                                                                                                                                                                                                             

src/python/strelka/tests/test_scan_iso.py .

===================================================================================================================================== 1 passed in 0.66s ======================================================================================================================================

Sample output

...
            "meta": {
                "date_created": "2022-12-11T18:42:00",
                "date_effective": None,
                "date_expiration": None,
                "date_modification": "2022-12-11T18:42:00",
                "volume_identifier": "NEW_VOLUME                      ",
            },
...

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of and tested my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

[ryanohoro]

LGTM