Upgrade MLflow client (#366) #1919

Job	Run time
build-router	1m 4s
build-api	3m 18s
build-cluster-init	14s
build-test-experiment-engine-plugin	32s
build-ui	7m 1s
release-rules	5s
test-engines-experiment	1m 27s
test-engines-router	3m 15s
test-api	8m 47s
test-e2e (In-cluster credentials; API e2e)	20m 17s
test-e2e (Remote cluster credentials; SDK e2e)	14m 18s
publish / publish-router	14s
publish / publish-app	50s
	1h 1m 22s

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