Dockerfile: update buildx to v0.12.0

Update the version of buildx we use in the dev-container to v0.12.0

Release notes: https://github.com/docker/buildx/releases/tag/v0.12.0

Full diff: https://github.com/docker/buildx/compare/v0.11.1...v0.12.0

Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>

Dockerfile

@@ -12,7 +12,7 @@ ARG DOCKERCLI_VERSION=v24.0.2
 # cli version used for integration-cli tests
 ARG DOCKERCLI_INTEGRATION_REPOSITORY="https://github.com/docker/cli.git"
 ARG DOCKERCLI_INTEGRATION_VERSION=v17.06.2-ce
-ARG BUILDX_VERSION=0.11.2
+ARG BUILDX_VERSION=0.12.0
 ARG COMPOSE_VERSION=v2.20.1
 
 ARG SYSTEMD="false"