build(deps): bump github.com/moby/buildkit from 0.26.2 to 0.26.3

Bumps [github.com/moby/buildkit](https://github.com/moby/buildkit) from 0.26.2 to 0.26.3.
- [Release notes](https://github.com/moby/buildkit/releases)
- [Commits](https://github.com/moby/buildkit/compare/v0.26.2...v0.26.3)

---
updated-dependencies:
- dependency-name: github.com/moby/buildkit
  dependency-version: 0.26.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

go.mod

@@ -29,7 +29,7 @@ require (
 	github.com/jonboulle/clockwork v0.5.0
 	github.com/mattn/go-shellwords v1.0.12
 	github.com/mitchellh/go-ps v1.0.0
-	github.com/moby/buildkit v0.26.2
+	github.com/moby/buildkit v0.26.3
 	github.com/moby/go-archive v0.1.0
 	github.com/moby/patternmatcher v0.6.0
 	github.com/moby/sys/atomicwriter v0.1.0

go.sum

@@ -251,8 +251,8 @@ github.com/mitchellh/hashstructure/v2 v2.0.2/go.mod h1:MG3aRVU/N29oo/V/IhBX8GR/z
 github.com/mitchellh/mapstructure v0.0.0-20150613213606-2caf8efc9366/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
 github.com/mitchellh/mapstructure v1.5.0 h1:jeMsZIYE/09sWLaz43PL7Gy6RuMjD2eJVyuac5Z2hdY=
 github.com/mitchellh/mapstructure v1.5.0/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
-github.com/moby/buildkit v0.26.2 h1:EIh5j0gzRsCZmQzvgNNWzSDbuKqwUIiBH7ssqLv8RU8=
-github.com/moby/buildkit v0.26.2/go.mod h1:ylDa7IqzVJgLdi/wO7H1qLREFQpmhFbw2fbn4yoTw40=
+github.com/moby/buildkit v0.26.3 h1:D+ruZVAk/3ipRq5XRxBH9/DIFpRjSlTtMbghT5gQP9g=
+github.com/moby/buildkit v0.26.3/go.mod h1:4T4wJzQS4kYWIfFRjsbJry4QoxDBjK+UGOEOs1izL7w=
 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/go-archive v0.1.0 h1:Kk/5rdW/g+H8NHdJW2gsXyZ7UnzvJNOy6VKJqueWdcQ=