bump to python 3.12

Co-authored-by: Mircea Ulinic <[email protected]>

Dockerfile

@@ -3,12 +3,12 @@
 FROM scratch AS installer
 COPY ./ /var/cache/napalm/
 
-FROM python:3.9-slim
+FROM python:3.12-slim-bookworm
 
 RUN --mount=type=bind,from=installer,source=/var/cache/napalm,target=/var/cache/napalm,rw \
     apt-get update && \
     apt-get install -y \
-        python3.9-dev libxslt1-dev libssl-dev libffi-dev && \
+        python3-dev libxslt1-dev libssl-dev libffi-dev && \
     apt-get autoremove && \
     rm -rf /var/lib/apt/lists/* && \
     pip --no-cache-dir install -U cffi cryptography /var/cache/napalm/