Update defectdojo/defectdojo-nginx Docker tag to v2.28.1

This MR contains the following updates:

Package	Type	Update	Change
defectdojo/defectdojo-nginx	ironbank-docker	patch	2.28.0 -> 2.28.1
defectdojo/defectdojo-nginx		patch	2.28.0 -> 2.28.1
defectdojo/defectdojo-nginx	stage	patch	2.28.0 -> 2.28.1

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