update xx to v1.6.1 for compatibility with alpine 3.21

This fixes compatibility with alpine 3.21

- Fix additional possible `xx-cc`/`xx-cargo` compatibility issue with Alpine 3.21
- Support for Alpine 3.21
- Fix `xx-verify` with `file` 5.46+
- Fix possible error taking lock in `xx-apk` in latest Alpine without `coreutils`

full diff: tonistiigi/xx@v1.5.0...v1.6.1

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

Author: thaJeztah

Dockerfile

@@ -5,7 +5,7 @@ ARG ALPINE_VERSION=3.20
 ARG BASE_DEBIAN_DISTRO=bookworm
 
 ARG GO_VERSION=1.23.4
-ARG XX_VERSION=1.5.0
+ARG XX_VERSION=1.6.1
 ARG GOVERSIONINFO_VERSION=v1.4.1
 ARG GOTESTSUM_VERSION=v1.10.0
 ARG BUILDX_VERSION=0.18.0