Update confluentinc/cp-ksqldb-server Docker tag to v7.7.1

This MR contains the following updates:

Package	Type	Update	Change
confluentinc/cp-ksqldb-server		patch	7.7.0-1-ubi8 -> 7.7.1-1-ubi8
confluentinc/cp-ksqldb-server	ironbank-docker	patch	7.7.0 -> 7.7.1
confluentinc/cp-ksqldb-server	stage	patch	7.7.0 -> 7.7.1

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