chore(deps): update registry.suse.com/bci/bci-base docker tag to v15.6 (master)

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
registry.suse.com/bci/bci-base (source)	docker	minor	15.5 -> 15.6
registry.suse.com/bci/bci-base (source)	final	minor	15.5 -> 15.6

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