* Use Debian 12 in docker image

* Update to PostgreSQL 15
* Update install method for node.js, update to Node 18

docker/Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.10-bullseye AS server
+FROM python:3.10-bookworm AS server
 
 ARG USER_ID=1000
 ARG GROUP_ID=1000
@@ -14,17 +14,18 @@ ENV PYTHONPATH /app
 # Install required software.
 RUN apt-get update \
     # Enable downloading packages over https
-    && apt-get install -y apt-transport-https \
-    # Get source for node.js
-    && curl -fsSL https://deb.nodesource.com/setup_16.x | bash - \
+    && apt-get install -y apt-transport-https ca-certificates curl gnupg; \
+    # Add source for node.js
+    curl -fsSL https://deb.nodesource.com/gpgkey/nodesource-repo.gpg.key | gpg --dearmor -o /etc/apt/keyrings/nodesource.gpg \
+    && echo "deb [signed-by=/etc/apt/keyrings/nodesource.gpg] https://deb.nodesource.com/node_18.x nodistro main" | tee /etc/apt/sources.list.d/nodesource.list; \
     # Install software
-    && apt-get update \
+    apt-get update \
     && apt-get install -y --no-install-recommends \
         build-essential \
         libmemcached-dev \
         nodejs \
         postgresql-client \
-        postgresql-server-dev-13 \
+        postgresql-server-dev-15 \
     # Clean up what can be cleaned up.
     && apt-get autoremove -y