Merge pull request #1167 from crazy-max/buildx-0.21.1

[master] update buildx to v0.21.1

Author: thaJeztah

common.mk

@@ -43,7 +43,7 @@ DOCKER_ENGINE_REF  ?= $(REF)
 DOCKER_COMPOSE_REF ?= v2.33.0
 # DOCKER_BUILDX_REF is the version of compose to package. It usually is a tag,
 # but can be a valid git reference in DOCKER_BUILDX_REPO.
-DOCKER_BUILDX_REF  ?= v0.21.0
+DOCKER_BUILDX_REF  ?= v0.21.1
 
 # Use "stage" to install dependencies from download-stage.docker.com during the
 # verify step. Leave empty or use any other value to install from download.docker.com