[FIX] packaging: build and test tgz from latest debian

The source packaging was a bit left behind, it was still using Debian
buster to build and test.

With this commit the Debian bookworm is used. As the installation of pip
packages as root is now forbidden, the build and tests are now using a
python virtual environment aka venv.

closes odoo/odoo#139482

Signed-off-by: Christophe Monniez (moc) <moc@odoo.com>

setup/package.dfsrc

@@ -1,6 +1,6 @@
 # Please note that this Dockerfile is used for testing nightly builds and should
 # not be used to deploy Odoo
-FROM debian:buster
+FROM debian:bookworm
 MAINTAINER Odoo S.A. <info@odoo.com>
 
 RUN apt-get update && \
@@ -23,15 +23,12 @@ RUN apt-get update -qq &&  \
 		libldap2-dev \
 		libsasl2-dev \
 		python3-pip \
+		python3-venv \
 		python3-wheel \
 		build-essential \
 		python3 -y && \
 	rm -rf /var/lib/apt/lists/*
 
-RUN pip3 install --upgrade pip
-
 COPY requirements.txt /opt/release/requirements.txt
 
-RUN pip3 install -r /opt/release/requirements.txt
-
 RUN echo "PS1=\"[\u@nightly-tests] # \"" > ~/.bashrc