chore(deps): update rancher/mirrored-tonistiigi-xx docker tag to v1.6.1

Author: renovate-rancher[bot]

package/Dockerfile

@@ -1,5 +1,5 @@
 # Image that provides cross compilation tooling.
-FROM --platform=$BUILDPLATFORM rancher/mirrored-tonistiigi-xx:1.5.0 AS xx
+FROM --platform=$BUILDPLATFORM rancher/mirrored-tonistiigi-xx:1.6.1 AS xx
 
 FROM --platform=$BUILDPLATFORM registry.suse.com/bci/golang:1.24 AS builder