build: automatic update of edge-testkube-cloud-ui

updates image kubeshop/testkube-cloud-ui tag '2.7.4-rc.1' to '2.7.4-rc.2'

Author: argocd-image-updater

charts/testkube-cloud-ui/.argocd-source-edge-testkube-cloud-ui.yaml

@@ -7,5 +7,5 @@ helm:
     value: docker.io/kubeshop/testkube-cloud-ui
     forcestring: true
   - name: image.tag
-    value: 2.7.4-rc.1
+    value: 2.7.4-rc.2
     forcestring: true