dockerfile: update buildkit to 0.19.0-rc2

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

Author: crazy-max

.github/workflows/build.yml

@@ -54,9 +54,9 @@ jobs:
           - master
           - latest
           - buildx-stable-1
+          - v0.19.0-rc2
           - v0.18.2
           - v0.17.2
-          - v0.16.0
         worker:
           - docker-container
           - remote

Dockerfile

@@ -10,7 +10,7 @@ ARG DOCKER_VERSION_ALT_26=26.1.3
 ARG DOCKER_CLI_VERSION=${DOCKER_VERSION}
 ARG GOTESTSUM_VERSION=v1.12.0
 ARG REGISTRY_VERSION=2.8.3
-ARG BUILDKIT_VERSION=v0.18.2
+ARG BUILDKIT_VERSION=v0.19.0-rc2
 ARG UNDOCK_VERSION=0.9.0
 
 FROM --platform=$BUILDPLATFORM tonistiigi/xx:${XX_VERSION} AS xx