Bump UI docker image

Update to current Node/Debian Docker image.
* Bump elm-format to current release.

Signed-off-by: SuperQ <superq@gmail.com>

ui/Dockerfile

@@ -1,13 +1,11 @@
-# elm-format only works with buster variants of the NodeJS container image.
-# See https://github.com/avh4/elm-format/issues/709 for more details.
-FROM node:14-buster
+FROM node:22-bookworm
 
 ENV NPM_CONFIG_PREFIX=/home/node/.npm-global
 ENV PATH=$PATH:/home/node/.npm-global/bin
 
 RUN mkdir -p $NPM_CONFIG_PREFIX; yarn global add \
   elm@0.19.1 \
-  elm-format@0.8.5 \
+  elm-format@0.8.7 \
   elm-test@0.19.1-revision6 \
   uglify-js@3.13.4 \
   elm-review@2.5.0