Bump Python base Docker image to 3.12

Dockerfile

@@ -34,7 +34,7 @@ ENV APP_BUILD_HASH=${BUILD_HASH}
 RUN npm run build
 
 ######## WebUI backend ########
-FROM python:3.11-slim-bookworm AS base
+FROM python:3.12-slim-bookworm AS base
 
 # Use args
 ARG USE_CUDA