Update module github.com/moby/buildkit to v0.11.6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/moby/buildkit	require	patch	v0.11.5 -> v0.11.6

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Release Notes

moby/buildkit

v0.11.6

Compare Source

https://hub.docker.com/r/moby/buildkit

Notable changes:

• Revert previous signal handling fix to make sure no process leaks happen. The signaling issue will be fixed in the next feature release. https://github.com/moby/buildkit/pull/3757
• Update runc to v1.1.5 for security https://github.com/moby/buildkit/pull/3763
• Update containerd to v1.6.20 . Brings in fix for not writing local user/group names in differ. #​3736
• Fix possible "duplicate output 0" error on parallel builds #​3774
• Fix token management for servers that don't return proper IssuedAt value #​3779
• Fix SBOM and provenance processing for certain nil-result cases #​3805

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