Update registry.opensource.zalan.do/acid/postgres-operator Docker tag to v1.12.1

This MR contains the following updates:

Package	Type	Update	Change
registry.opensource.zalan.do/acid/postgres-operator		minor	v1.11.0 -> v1.12.1
registry.opensource.zalan.do/acid/postgres-operator	ironbank-docker	minor	v1.11.0 -> v1.12.1
registry.opensource.zalan.do/acid/postgres-operator	stage	minor	v1.11.0 -> v1.12.1

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