cleanup Job Failed #38506 due to bad regex
Job [#38506](https://gitlab.rc.uab.edu/rc/ohpc-packer/-/jobs/38506) failed for 41c71b7297f3bafa64f9607a871f6633bc24f7ef:
The regex used to capture the date format change introduced in !21 is preventing clean up of older images.
This issue is fixed in https://gitlab.rc.uab.edu/rc/ohpc-packer/-/merge_requests/29
issue