Update to newer OS and Pg.

This is in response for report from Daniel Sauvé
https://gitlab.com/depesz/explain.depesz.com/-/issues/30

While their report didn't report issues with Pg, it's really time to
move off pg11.

docker/Dockerfile

@@ -1,4 +1,4 @@
-FROM debian:buster
+FROM debian:bookworm
 
 WORKDIR /explain
 
@@ -19,11 +19,10 @@ RUN apt-get update && \
                 libnumber-bytes-human-perl \
                 pgformatter \
                 curl \
-                build-essential
+                build-essential \
+                cpanminus
 
-RUN curl -L cpanmin.us | perl - -n Mojolicious
-
-RUN cpan install Pg::Explain
+RUN cpanm Pg::Explain
 
 WORKDIR /tmp
 RUN curl https://gitlab.com/depesz/pg-sql-prettyprinter/-/archive/main/pg-sql-prettyprinter-main.tar.bz2 -o pg-sql-prettyprinter-main.tar.bz2 && \

docker/docker-compose.yml

@@ -17,7 +17,7 @@ services:
       - ../ext:/explain/ext
       - ../templates:/explain/templates
   db:
-    image: "postgres:11.4"
+    image: "postgres:17-bookworm"
     environment:
       POSTGRES_USER: depesz_explain
       POSTGRES_PASSWORD: depesz_explain