Justin Chadwell 22ac3271d2 vendor: update moby/buildkit
Update modules:

  go mod edit -require github.com/moby/buildkit@master
  go mod tidy -compat=1.17 && ./hack/update-vendor

Signed-off-by: Justin Chadwell <me@jedevc.com>
..
diffcopy.go vendor: update buildkit
filesync.go vendor: update moby/buildkit
filesync.pb.go vendor: update buildkit to opentelemetry support
filesync.proto vendor: update buildkit to opentelemetry support
generate.go vendor: update buildkit to opentelemetry support