chore: update module github.com/moby/buildkit to v0.15.2

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

go.mod

@@ -9,7 +9,7 @@ require (
 	github.com/emicklei/dot v1.6.2
 	github.com/google/go-github/v63 v63.0.0
 	github.com/hashicorp/go-multierror v1.1.1
-	github.com/moby/buildkit v0.15.1
+	github.com/moby/buildkit v0.15.2
 	github.com/moby/docker-image-spec v1.3.1
 	github.com/opencontainers/go-digest v1.0.0
 	github.com/opencontainers/image-spec v1.1.0

go.sum

@@ -105,6 +105,8 @@ github.com/mitchellh/reflectwalk v1.0.0 h1:9D+8oIskB4VJBN5SFlmc27fSlIBZaov1Wpk/I
 github.com/mitchellh/reflectwalk v1.0.0/go.mod h1:mSTlrgnPZtwu0c4WaC2kGObEpuNDbx0jmZXqmk4esnw=
 github.com/moby/buildkit v0.15.1 h1:J6wrew7hphKqlq1wuu6yaUb/1Ra7gEzDAovylGztAKM=
 github.com/moby/buildkit v0.15.1/go.mod h1:Yis8ZMUJTHX9XhH9zVyK2igqSHV3sxi3UN0uztZocZk=
+github.com/moby/buildkit v0.15.2 h1:DnONr0AoceTWyv+plsQ7IhkSaj+6o0WyoaxYPyTFIxs=
+github.com/moby/buildkit v0.15.2/go.mod h1:Yis8ZMUJTHX9XhH9zVyK2igqSHV3sxi3UN0uztZocZk=
 github.com/moby/docker-image-spec v1.3.1 h1:jMKff3w6PgbfSa69GfNg+zN/XLhfXJGnEx3Nl2EsFP0=
 github.com/moby/docker-image-spec v1.3.1/go.mod h1:eKmb5VW8vQEh/BAr2yvVNvuiJuY6UIocYsFu/DxxRpo=
 github.com/moby/locker v1.0.1 h1:fOXqR41zeveg4fFODix+1Ch4mj/gT0NE1XJbp/epuBg=