build: Update qemu-docker to v6.13 (#1010)

Dockerfile

@@ -1,7 +1,7 @@
 ARG VERSION_ARG="latest"
 FROM scratch AS build-amd64
 
-COPY --from=qemux/qemu-docker:6.12 / /
+COPY --from=qemux/qemu-docker:6.13 / /
 
 ARG DEBCONF_NOWARNINGS="yes"
 ARG DEBIAN_FRONTEND="noninteractive"