chore(deps): update dependency itzg/mc-image-helper to v1.55.4 (#304)

Author: renovate[bot]

Dockerfile

@@ -39,7 +39,7 @@ RUN easy-add --var os=${TARGETOS} --var arch=${TARGETARCH}${TARGETVARIANT} \
 COPY templates/ /templates/
 
 # renovate: datasource=github-releases packageName=itzg/mc-image-helper
-ARG MC_HELPER_VERSION=1.55.3
+ARG MC_HELPER_VERSION=1.55.4
 ARG MC_HELPER_BASE_URL=${GITHUB_BASEURL}/itzg/mc-image-helper/releases/download/${MC_HELPER_VERSION}
 # used for cache busting local copy of mc-image-helper
 ARG MC_HELPER_REV=1