Update registry1.dso.mil/ironbank/opensource/nginx/nginx-alpine Docker tag to v1.29.3

This MR contains the following updates:

Package	Type	Update	Change
registry1.dso.mil/ironbank/opensource/nginx/nginx-alpine	ironbank-base	patch	1.29.2 -> 1.29.3
registry1.dso.mil/ironbank/opensource/nginx/nginx-alpine	final	patch	1.29.2-amd64 -> 1.29.3-amd64

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