Bump express from 4.19.2 to 4.21.2 in /pkg/ui/v1beta1/frontend #2007

Job	Run time
Publish Image (file-metrics-collector, cmd/metricscollector/v1beta1/file-metricscollector/Dockerf... / Publish Image	17m 30s
Publish Image (file-metrics-collector, cmd/metricscollector/v1beta1/file-metricscollector/Dockerf... / Publish Image	6m 25s
Publish Image (katib-controller, cmd/katib-controller/v1beta1/Dockerfile) / Publish Image	37m 40s
Publish Image (katib-controller, cmd/katib-controller/v1beta1/Dockerfile) / Publish Image	14m 34s
Publish Image (katib-db-manager, cmd/db-manager/v1beta1/Dockerfile) / Publish Image	33m 56s
Publish Image (katib-db-manager, cmd/db-manager/v1beta1/Dockerfile) / Publish Image	5m 4s
Publish Image (katib-ui, cmd/ui/v1beta1/Dockerfile) / Publish Image	20m 42s
Publish Image (katib-ui, cmd/ui/v1beta1/Dockerfile) / Publish Image	1h 27m 37s
Publish Image (tfevent-metrics-collector, cmd/metricscollector/v1beta1/tfevent-metricscollector/D... / Publish Image	28m 10s
Publish Image (tfevent-metrics-collector, cmd/metricscollector/v1beta1/tfevent-metricscollector/D... / Publish Image	7m 47s
	4h 19m 25s

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