Update releases-docker.jfrog.io/jfrog/xray-server Docker tag to v3.21.2

This MR contains the following updates:

Package	Type	Update	Change
releases-docker.jfrog.io/jfrog/xray-server	ironbank-docker	minor	3.18.0 -> 3.21.2
releases-docker.jfrog.io/jfrog/xray-server	stage	minor	3.18.0 -> 3.21.2

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