Update alfresco/alfresco-imagemagick Docker tag to v5 #691

Job	Run time
test	1m 15s
integration-test (community-6.1.2-ga)	2m 58s
integration-test (community-6.2.0-ga)	3m 3s
integration-test (community-7.0.0)	1m 44s
integration-test (community-7.1.1)	3m 2s
integration-test (community-7.2.0)	3m 0s
integration-test (community-7.3.0)	3m 4s
integration-test (community-7.4.0)	2m 59s
integration-test (enterprise-6.1.1)	2m 53s
integration-test (enterprise-6.2.2)	3m 10s
integration-test (enterprise-7.0.1)	3m 4s
integration-test (enterprise-7.1.0)	3m 33s
integration-test (enterprise-7.2.0)	1m 40s
integration-test (enterprise-7.3.0)	3m 6s
integration-test (enterprise-7.4.0)	3m 6s
publish	0s
	41m 37s

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