Update registry1.dso.mil/ironbank/opensource/python Docker tag to v3.13.8

This MR contains the following updates:

Package	Type	Update	Change
registry1.dso.mil/ironbank/opensource/python	ironbank-base	patch	3.13.5-alpine -> 3.13.8-alpine
registry1.dso.mil/ironbank/opensource/python	final	patch	3.13.5-alpine -> 3.13.8-alpine

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