Update Dockerfile - switch to Node 21

perl/Dockerfile

@@ -61,7 +61,7 @@ RUN apt-get update && apt-get -y install gnupg2 \
     libmodule-install-perl python3-setuptools libdist-zilla-perl && \
   apt-get -y install curl ca-certificates wget gnupg2 lsb-release && \
   (curl -fsSL https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add -) && \
-  echo "deb https://deb.nodesource.com/node_20.x $(lsb_release -s -c) main" | tee /etc/apt/sources.list.d/nodesource.list  && \
+  echo "deb https://deb.nodesource.com/node_21.x $(lsb_release -s -c) main" | tee /etc/apt/sources.list.d/nodesource.list  && \
   echo "deb http://apt.postgresql.org/pub/repos/apt/ $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list && \
   (wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add -) && \
   apt-get -y update && \