feat: Upgrade Taiga 6.5 and change git repo

[xolyu]

:arrow_up: Upgrade Taiga 6.5

Raised min_version to 6.0 because it's the lowest version in the new repo. Dropped support till version 5.x.

Since version 6.0 Taiga development changed repository from https://github.com/taigaio to https://github.com/kaleidos-ventures

New name kaleidos-ventures inserted into update.sh.