chore(deps): update module github.com/opencontainers/image-spec to v1.1.0-rc6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/opencontainers/image-spec	v1.1.0-rc5 -> v1.1.0-rc6

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Release Notes

opencontainers/image-spec (github.com/opencontainers/image-spec)

v1.1.0-rc6

Compare Source

Vote passed [+6 -0] - https://groups.google.com/a/opencontainers.org/g/dev/c/HOxZlfhr9-o

For changeset and diff please see - https://github.com/opencontainers/image-spec/pull/1157

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