fix test_mlflow_v2 by updating model to v1.19.0-dev build (#5888) #570

Job	Run time
executor	1m 53s
operator	2m 32s
rclone-storage-initializer	16s
s2i-wrapper	16m 2s
prepackaged-components (servers/sklearnserver)	1m 44s
prepackaged-components (servers/xgboostserver)	1m 38s
prepackaged-components (servers/mlflowserver)	4m 6s
prepackaged-components (servers/tfserving_proxy)	2m 24s
prepackaged-components (components/alibi-explain-server)	6m 14s
prepackaged-components (components/alibi-detect-server)	7m 5s
	43m 54s

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