update github.com/opencontainers/cgroups to v0.0.6

[Luap99]

Includes one small fix for a breaking change in a type.

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Does this PR introduce a user-facing change?

None

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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[ashley-cui]

LGTM

[inknos]

LGTM

[TomSweeneyRedHat]

LGTM

[TomSweeneyRedHat]

/lgtm