Update confluentinc/cp-schema-registry Docker tag to v7.7.2

This MR contains the following updates:

Package	Type	Update	Change
confluentinc/cp-schema-registry	ironbank-docker	patch	7.7.1 -> 7.7.2
confluentinc/cp-schema-registry	stage	patch	7.7.1 -> 7.7.2

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