Drop apt clean

which is called automatically

Dockerfile.debian-bookworm-hugo

@@ -5,6 +5,5 @@ ENV DEBIAN_FRONTEND=noninteractive
 RUN apt-get -qq update && \
     apt-get -qq upgrade && \
     apt-get -qq install hugo && \
-    apt-get -qq clean && \
     rm -rf /var/lib/apt/lists/* && \
     hugo version

Dockerfile.debian-trixie-hugo

@@ -5,5 +5,4 @@ ENV DEBIAN_FRONTEND=noninteractive
 RUN apt-get -qq update && \
     apt-get -qq upgrade && \
     apt-get -qq install hugo && \
-    apt-get -qq clean && \
     rm -rf /var/lib/apt/lists/*