Update defectdojo/defectdojo-django Docker tag to v2.20.0

This MR contains the following updates:

Package	Type	Update	Change
defectdojo/defectdojo-django	ironbank-docker	minor	2.19.4 -> 2.20.0
defectdojo/defectdojo-django		minor	2.19.4 -> 2.20.0
defectdojo/defectdojo-django	stage	minor	2.19.4 -> 2.20.0

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