[Port dspace-9_x] Fix Mirador build warnings on 9.x #11817

Job	Run time
dspace-angular / docker-build (linux/amd64, true)	3m 47s
dspace-angular-dist / docker-build (linux/amd64, true)	9m 1s
dspace-angular / docker-build_manifest	0s
dspace-angular / docker-copy_to_dockerhub	0s
docker-deploy	7m 23s
dspace-angular-dist / docker-copy_to_dockerhub	-1s
dspace-angular-dist / docker-build_manifest	-1s
	20m 9s

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