build(deps): bump github.com/moby/buildkit from 0.12.2 to 0.12.3 (#2060)

Bumps [github.com/moby/buildkit](https://github.com/moby/buildkit) from 0.12.2 to 0.12.3.
- [Release notes](https://github.com/moby/buildkit/releases)
- [Commits](moby/buildkit@v0.12.2...v0.12.3)

---
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>

go.mod

@@ -19,7 +19,7 @@ require (
 	github.com/julienschmidt/httprouter v1.3.0
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51
 	github.com/mattn/go-isatty v0.0.19
-	github.com/moby/buildkit v0.12.2
+	github.com/moby/buildkit v0.12.3
 	github.com/moby/patternmatcher v0.6.0
 	github.com/opencontainers/image-spec v1.1.0-rc5
 	github.com/opencontainers/selinux v1.11.0

go.sum

@@ -115,8 +115,8 @@ github.com/mgutz/ansi v0.0.0-20170206155736-9520e82c474b h1:j7+1HpAFS1zy5+Q4qx1f
 github.com/mgutz/ansi v0.0.0-20170206155736-9520e82c474b/go.mod h1:01TrycV0kFyexm33Z7vhZRXopbI8J3TDReVlkTgMUxE=
 github.com/mitchellh/mapstructure v1.1.2 h1:fmNYVwqnSfB9mZU6OS2O6GsXM+wcskZDuKQzvN1EDeE=
 github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
-github.com/moby/buildkit v0.12.2 h1:B7guBgY6sfk4dBlv/ORUxyYlp0UojYaYyATgtNwSCXc=
-github.com/moby/buildkit v0.12.2/go.mod h1:adB4y0SxxX8trnrY+oEulb48ODLqPO6pKMF0ppGcCoI=
+github.com/moby/buildkit v0.12.3 h1:cFaPVnyC0PwAP5xHHfzdU5v9rgQrCi6HnGSg3WuFKp4=
+github.com/moby/buildkit v0.12.3/go.mod h1:adB4y0SxxX8trnrY+oEulb48ODLqPO6pKMF0ppGcCoI=
 github.com/moby/patternmatcher v0.6.0 h1:GmP9lR19aU5GqSSFko+5pRqHi+Ohk1O69aFiKkVGiPk=
 github.com/moby/patternmatcher v0.6.0/go.mod h1:hDPoyOpDY7OrrMDLaYoY3hf52gNCR/YOUYxkhApJIxc=
 github.com/moby/sys/sequential v0.5.0 h1:OPvI35Lzn9K04PBbCLW0g4LcFAJgHsvXsRyewg5lXtc=