Build broken: 7zip 24.09 download URL returns 404

[partymola]

The Docker image build fails because the 7zip download URL in build/root/install.sh points to version 24.09, which has been removed from 7-zip.org:

curl -o /tmp/7zip.tar.xz -L https://www.7-zip.org/a/7z2409-linux-x64.tar.xz

Returns HTTP 404 (162-byte error page), causing tar to fail:

tar: This does not look like a tar archive
xz: (stdin): File format not recognized

Current version on 7-zip.org is 26.00. Fix is to update the URLs to 7z2600-linux-x64.tar.xz and 7z2600-linux-arm64.tar.xz.

PR incoming.

[partymola]

PR with the fix (plus a second build fix for python path resolution): #446