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

Author: renovate-rancher[bot]

package/Dockerfile

@@ -18,7 +18,7 @@ RUN make
 # base image
 FROM registry.suse.com/bci/bci-micro:15.7 AS micro
 FROM registry.suse.com/bci/bci-base:15.7 AS base
-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/bci-base:15.7 AS basebuilder
 
 ARG TARGETPLATFORM