Update registry.opensource.zalan.do/acid/postgres-operator Docker tag to v1.6.3

This MR contains the following updates:

Package	Type	Update	Change
registry.opensource.zalan.do/acid/postgres-operator		patch	v1.6.2 -> v1.6.3
registry.opensource.zalan.do/acid/postgres-operator	stage	patch	v1.6.2 -> v1.6.3

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