Update registry1.dso.mil/ironbank/opensource/nginx/nginx Docker tag to v1.26.0

This MR contains the following updates:

Package	Type	Update	Change
registry1.dso.mil/ironbank/opensource/nginx/nginx	ironbank-base	minor	1.25.4 -> 1.26.0
registry1.dso.mil/ironbank/opensource/nginx/nginx	final	minor	1.25.4 -> 1.26.0

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