Docker: use latest python and debian (#7242)

* docker: use latest python and debian

* [autofix.ci] apply automated fixes

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

CHANGELOG.md

@@ -7,6 +7,8 @@
 
 ## Unreleased: mitmproxy next
 
+- Docker: Update image to Python 3.13 on Debian Bookworm.
+  ([#7242](https://github.com/mitmproxy/mitmproxy/pull/7242), @mhils)
 - Tighten HTTP detection heuristic to better support custom TCP-based protocols.
   ([#7228](https://github.com/mitmproxy/mitmproxy/pull/7228), @fatanugraha)
 

release/docker/Dockerfile

@@ -1,9 +1,9 @@
-FROM python:3.11-bullseye AS wheelbuilder
+FROM python:3.13-bookworm AS wheelbuilder
 
 COPY mitmproxy-*-py3-none-any.whl /wheels/
 RUN pip install wheel && pip wheel --wheel-dir /wheels /wheels/*.whl
 
-FROM python:3.11-slim-bullseye
+FROM python:3.13-slim-bookworm
 
 RUN useradd -mU mitmproxy
 RUN apt-get update \

release/docker/docker-entrypoint.sh

@@ -15,7 +15,8 @@ fi
 usermod -o \
     -u $(stat -c "%u" "$f") \
     -g $(stat -c "%g" "$f") \
-    mitmproxy
+    mitmproxy \
+    >/dev/null  # hide "usermod: no changes"
 
 if [[ "$1" = "mitmdump" || "$1" = "mitmproxy" || "$1" = "mitmweb" ]]; then
   exec gosu mitmproxy "$@"