test(deps): update dependency buildx to v0.21.1 (#1854)

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

Author: renovate[bot]

linux/test/run.sh

@@ -25,7 +25,7 @@ install-tool docker-compose 1.29.2
 install-tool docker-compose v2.33.0
 
 # renovate: datasource=github-releases packageName=docker/buildx
-install-tool buildx v0.21.0
+install-tool buildx v0.21.1
 
 # renovate: datasource=github-releases packageName=kubernetes-sigs/kustomize
 install-tool kustomize 4.0.4