build(deps): bump github.com/moby/buildkit from 0.11.5 to 0.11.6 (#1817)

Bumps [github.com/moby/buildkit](https://github.com/moby/buildkit) from 0.11.5 to 0.11.6.
- [Release notes](https://github.com/moby/buildkit/releases)
- [Commits](https://github.com/moby/buildkit/compare/v0.11.5...v0.11.6)

---
updated-dependencies:
- dependency-name: github.com/moby/buildkit
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

go.mod

@@ -19,9 +19,9 @@ require (
 	github.com/julienschmidt/httprouter v1.3.0
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51
 	github.com/mattn/go-isatty v0.0.18
-	github.com/moby/buildkit v0.11.5
+	github.com/moby/buildkit v0.11.6
 	github.com/moby/patternmatcher v0.5.0
-	github.com/opencontainers/image-spec v1.1.0-rc.3
+	github.com/opencontainers/image-spec v1.1.0-rc2.0.20221005185240-3a7f492d3f1b
 	github.com/opencontainers/selinux v1.11.0
 	github.com/pkg/errors v0.9.1
 	github.com/rhysd/actionlint v1.6.24
@@ -42,7 +42,7 @@ require (
 	github.com/ProtonMail/go-crypto v0.0.0-20230217124315-7d5c6f04bbb8 // indirect
 	github.com/acomagu/bufpipe v1.0.4 // indirect
 	github.com/cloudflare/circl v1.3.3 // indirect
-	github.com/containerd/containerd v1.6.19 // indirect
+	github.com/containerd/containerd v1.6.20 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/docker/docker-credential-helpers v0.7.0 // indirect
 	github.com/docker/go-units v0.5.0 // indirect