Update buildx reference to v0.21.3 (#22267)

Update the buildx reference documentation to keep in sync with the
latest release `v0.21.3`

Signed-off-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: crazy-max <[email protected]>

Author: docker-tools-robot

_vendor/modules.txt

@@ -1,6 +1,6 @@
 # github.com/moby/moby v28.0.1+incompatible
 # github.com/moby/buildkit v0.20.1
-# github.com/docker/buildx v0.21.2
+# github.com/docker/buildx v0.21.3
 # github.com/docker/cli v28.0.1+incompatible
 # github.com/docker/compose/v2 v2.34.0
 # github.com/docker/scout-cli v1.15.0

go.mod

@@ -3,7 +3,7 @@ module github.com/docker/docs
 go 1.23.6
 
 require (
-	github.com/docker/buildx v0.21.2 // indirect
+	github.com/docker/buildx v0.21.3 // indirect
 	github.com/docker/cli v28.0.1+incompatible // indirect
 	github.com/docker/compose/v2 v2.34.0 // indirect
 	github.com/docker/scout-cli v1.15.0 // indirect
@@ -12,7 +12,7 @@ require (
 )
 
 replace (
-	github.com/docker/buildx => github.com/docker/buildx v0.21.2
+	github.com/docker/buildx => github.com/docker/buildx v0.21.3
 	github.com/docker/cli => github.com/docker/cli v28.0.1+incompatible
 	github.com/docker/compose/v2 => github.com/docker/compose/v2 v2.34.0
 	github.com/docker/scout-cli => github.com/docker/scout-cli v1.15.0

go.sum

@@ -98,6 +98,8 @@ github.com/docker/buildx v0.21.1 h1:YjV2k6CsSDbkDTOMsjARUIrj2xv+zZR+M2dtrRyzXhg=
 github.com/docker/buildx v0.21.1/go.mod h1:8V4UMnlKsaGYwz83BygmIbJIFEAYGHT6KAv8akDZmqo=
 github.com/docker/buildx v0.21.2 h1:r09paH8q9nvAX2PR1ntRrc+C6FBH93bvKUsn1WOb/jU=
 github.com/docker/buildx v0.21.2/go.mod h1:8V4UMnlKsaGYwz83BygmIbJIFEAYGHT6KAv8akDZmqo=
+github.com/docker/buildx v0.21.3 h1:LEmhk3D9WOboMeC+hlfOUnB1jylXcDfGHjqAL7Tvwks=
+github.com/docker/buildx v0.21.3/go.mod h1:8V4UMnlKsaGYwz83BygmIbJIFEAYGHT6KAv8akDZmqo=
 github.com/docker/cli v24.0.2+incompatible h1:QdqR7znue1mtkXIJ+ruQMGQhpw2JzMJLRXp6zpzF6tM=
 github.com/docker/cli v24.0.2+incompatible/go.mod h1:JLrzqnKDaYBop7H2jaqPtU4hHvMKP+vjCwu2uszcLI8=
 github.com/docker/cli v24.0.4+incompatible h1:Y3bYF9ekNTm2VFz5U/0BlMdJy73D+Y1iAAZ8l63Ydzw=