Update build environment to Debian 12 Bookworm

Dockerfile

@@ -1,9 +1,9 @@
 # To build and publish image run following commands:
-# > docker build -t cahirwpz/demoscene-toolchain:latest .
+# > docker image build -t cahirwpz/demoscene-toolchain:latest .
 # > docker login
 # > docker push cahirwpz/demoscene-toolchain:latest
 
-FROM debian:bullseye-backports
+FROM debian:bookworm-backports
 
 WORKDIR /root
 
@@ -14,4 +14,4 @@ RUN apt-get install -y --no-install-recommends \
             libsdl2-dev libsdl2-ttf-dev libopenal-dev libtool make patch \
             pkg-config python3 python3-dev python3-pip quilt texinfo zip
 COPY requirements.txt .
-RUN pip3 install setuptools wheel && pip3 install -r requirements.txt
+RUN pip3 install --break-system-packages -r requirements.txt