Dockerfile: update buildx to v0.12.1

Update the version of buildx used in CI to the latest version.

- full diff: https://github.com/docker/buildx/compare/v0.12.0...v0.12.1
- release notes: https://github.com/docker/buildx/releases/tag/v0.12.1

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Dockerfile

@@ -8,7 +8,7 @@ ARG GO_VERSION=1.21.6
 ARG XX_VERSION=1.2.1
 ARG GOVERSIONINFO_VERSION=v1.3.0
 ARG GOTESTSUM_VERSION=v1.10.0
-ARG BUILDX_VERSION=0.12.0
+ARG BUILDX_VERSION=0.12.1
 ARG COMPOSE_VERSION=v2.24.0
 
 FROM --platform=$BUILDPLATFORM tonistiigi/xx:${XX_VERSION} AS xx

dockerfiles/Dockerfile.dev

@@ -3,7 +3,7 @@
 ARG GO_VERSION=1.21.6
 ARG ALPINE_VERSION=3.18
 
-ARG BUILDX_VERSION=0.12.0
+ARG BUILDX_VERSION=0.12.1
 FROM docker/buildx-bin:${BUILDX_VERSION} AS buildx
 
 FROM golang:${GO_VERSION}-alpine${ALPINE_VERSION} AS golang