Update registry1.dso.mil/ironbank/opensource/nginx/nginx-alpine Docker tag to v1.29.2

This MR contains the following updates:

Package	Type	Update	Change
registry1.dso.mil/ironbank/opensource/nginx/nginx-alpine		minor	1.28.0 -> 1.29.2
registry1.dso.mil/ironbank/opensource/nginx/nginx-alpine	ironbank-base	minor	1.28.0 -> 1.29.2

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