Update cfsprodacr.azurecr.io/cfs-master/cfs-currentvalueworker Docker tag to v2023.07.21.4

This MR contains the following updates:

Package	Update	Change
cfsprodacr.azurecr.io/cfs-master/cfs-currentvalueworker	patch	2023.07.20.2 -> 2023.07.21.4

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