Bookworm ready python install in venv

[thicknesss]

Hi all,
because bookworm enforeces virtual enviroments for python we need to make some changes in below snippet:

openhabian/functions/packages.bash

Lines 444 to 445 in 9d6fbd6

	cond_echo "Installing required python packages"
	cond_redirect pip3 install -r "$mifloraDir"/requirements.txt

The venv must be prepared:
python -m venv --system-site-packages env
and activated
source env/bin/activate
before PIP is used to install the requirements.
for the package a pr is made to update the template.service

Brgds André

[mstormi]

Fixed-By: #1869