Feature Request: support dicom datetime with timezone information

[AlanKuurstra]

Summary

Dicom conversion fails if the dicom datetime contains timezone information, eg. "20230905141258.340-0400"

Traceback (most recent call last):
File "/usr/local/bin/heudiconv", line 8, in
sys.exit(main())
File "/usr/local/lib/python3.9/dist-packages/heudiconv/cli/run.py", line 30, in main
workflow(**kwargs)
File "/usr/local/lib/python3.9/dist-packages/heudiconv/main.py", line 479, in workflow
prep_conversion(
File "/usr/local/lib/python3.9/dist-packages/heudiconv/convert.py", line 259, in prep_conversion
convert(
File "/usr/local/lib/python3.9/dist-packages/heudiconv/convert.py", line 637, in convert
save_scans_key(item, bids_outfiles)
File "/usr/local/lib/python3.9/dist-packages/heudiconv/bids.py", line 494, in save_scans_key
rows[f_name] = get_formatted_scans_key_row(item[-1][0])
File "/usr/local/lib/python3.9/dist-packages/heudiconv/bids.py", line 579, in get_formatted_scans_key_row
acq_datetime = dicoms.get_datetime_from_dcm(dcm_data=dcm_data)
File "/usr/local/lib/python3.9/dist-packages/heudiconv/dicoms.py", line 536, in get_datetime_from_dcm
return strptime_micr(acq_dt, "%Y%m%d%H%M%S[.%f]")
File "/usr/local/lib/python3.9/dist-packages/heudiconv/utils.py", line 689, in strptime_micr
return datetime.strptime(date_string, fmt)
File "/usr/lib/python3.9/_strptime.py", line 568, in _strptime_datetime
tt, fraction, gmtoff_fraction = _strptime(data_string, format)
File "/usr/lib/python3.9/_strptime.py", line 352, in _strptime
raise ValueError("unconverted data remains: %s" %
ValueError: unconverted data remains: .372-0400

Perhaps strptime_micr could support a fmt with an additional optional [%z]?