Update quorumengineering/quorum Docker tag to v22.7.6

This MR contains the following updates:

Package	Type	Update	Change
quorumengineering/quorum	ironbank-docker	patch	22.7.5 -> 22.7.6
quorumengineering/quorum		patch	22.7.5 -> 22.7.6
quorumengineering/quorum	stage	patch	22.7.5 -> 22.7.6

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