Bump ng-mocks from 14.14.0 to 14.15.0 in the testing group #8924

Job	Run time
dspace-angular-dist / docker-build (linux/amd64, true)	8m 54s
dspace-angular / docker-build (linux/amd64, true)	4m 37s
dspace-angular-dist / docker-build_manifest	0s
dspace-angular-dist / docker-copy_to_dockerhub	0s
dspace-angular / docker-build_manifest	-1s
dspace-angular / docker-copy_to_dockerhub	0s
	13m 30s

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