build: Update qemu-docker to v7.04 (#213)

Author: renovate[bot]

Dockerfile

@@ -10,7 +10,7 @@ RUN apk --update --no-cache add unzip && \
     rm -rf /tmp/* /var/tmp/* /var/cache/apk/*
 
 FROM scratch AS runner
-COPY --from=qemux/qemu:7.03 / /
+COPY --from=qemux/qemu:7.04 / /
 
 ARG VERSION_ARG="0.0"
 ARG VERSION_KVM_OPENCORE="v21"