Update quay.io/mongodb/mongodb-agent-ubi Docker tag to v12.0.15.7646

This MR contains the following updates:

Package	Type	Update	Change
quay.io/mongodb/mongodb-agent-ubi	ironbank-docker	patch	12.0.11.7606-1-context -> 12.0.15.7646-1-context
quay.io/mongodb/mongodb-agent-ubi		patch	12.0.11.7606-1 -> 12.0.15.7646-1
quay.io/mongodb/mongodb-agent-ubi	stage	patch	12.0.11.7606-1-context -> 12.0.15.7646-1-context

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