Update confluentinc/cp-enterprise-control-center Docker tag to v7.6.2

This MR contains the following updates:

Package	Type	Update	Change
confluentinc/cp-enterprise-control-center	ironbank-docker	patch	7.6.1 -> 7.6.2
confluentinc/cp-enterprise-control-center	stage	patch	7.6.1 -> 7.6.2

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