Dockerfile: use bookworm instead of buster since buster is past EOL

[lee-treehouse]

Update dockerfile to use Bookworm instead of Buster, since Buster is past EOL and running tests locally will fail.

 > [dev base 2/3] RUN apt-get update   && apt-get install -y libpq-dev   && rm -rf /var/lib/apt/lists/*:                            
0.585 Ign:1 http://deb.debian.org/debian buster InRelease                                                                           
0.825 Ign:2 http://deb.debian.org/debian-security buster/updates InRelease                                                          
0.833 Ign:3 http://deb.debian.org/debian buster-updates InRelease                                                                   
0.840 Err:4 http://deb.debian.org/debian buster Release
0.840   404  Not Found [IP: 151.101.2.132 80]
1.082 Err:5 http://deb.debian.org/debian-security buster/updates Release
1.082   404  Not Found [IP: 151.101.2.132 80]
1.099 Err:6 http://deb.debian.org/debian buster-updates Release
1.099   404  Not Found [IP: 151.101.2.132 80]
1.109 Reading package lists...
1.126 E: The repository 'http://deb.debian.org/debian buster Release' does not have a Release file.
1.126 E: The repository 'http://deb.debian.org/debian-security buster/updates Release' does not have a Release file.
1.126 E: The repository 'http://deb.debian.org/debian buster-updates Release' does not have a Release file.

[ZimbiX]

Cheers! Tested and working locally. Looks like we might have other problems with CI

[lee-treehouse]

Cheers! Tested and working locally. Looks like we might have other problems with CI

I had a look and have a fix here #444