build(deps): bump github.com/moby/buildkit from 0.11.5 to 0.12.5 (#2188)

Bumps [github.com/moby/buildkit](https://github.com/moby/buildkit) from 0.11.5 to 0.12.5.
- [Release notes](https://github.com/moby/buildkit/releases)
- [Commits](https://github.com/moby/buildkit/compare/v0.11.5...v0.12.5)

---
updated-dependencies:
- dependency-name: github.com/moby/buildkit
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[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 v0.0.20
-	github.com/moby/buildkit v0.11.5
+	github.com/moby/buildkit v0.12.5
 	github.com/moby/patternmatcher v0.6.0
-	github.com/opencontainers/image-spec v1.1.0-rc2.0.20221005185240-3a7f492d3f1b
+	github.com/opencontainers/image-spec v1.1.0-rc3
 	github.com/opencontainers/selinux v1.11.0
 	github.com/pkg/errors v0.9.1
 	github.com/rhysd/actionlint v1.6.26
@@ -42,7 +42,7 @@ require (
 	github.com/Microsoft/go-winio v0.6.1 // indirect
 	github.com/ProtonMail/go-crypto v0.0.0-20230828082145-3c4c8a2d2371 // indirect
 	github.com/cloudflare/circl v1.3.7 // indirect
-	github.com/containerd/containerd v1.6.26 // indirect
+	github.com/containerd/containerd v1.7.2 // indirect
 	github.com/cyphar/filepath-securejoin v0.2.4 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/distribution/reference v0.5.0 // indirect