Updating from 6.0.10-6-g8e9853b to 6.7.6

I’m running 6.0.10-6-g8e9853b on a self hosted device. When I go git pull I getthe following.

[taiga@taiga taiga-front-dist]$ git pull
Username for ‘https://github.com’: csmu-cenr
Password for ‘https://cenr-cenr@github.com’:
remote: Support for password authentication was removed on August 13, 2021.
remote: Please see About remote repositories - GitHub Docs for information on currently recommended modes of authentication.

fatal: Authentication failed for ‘https://github.com/taigaio/taiga-front-dist.git/

When I go to the link https://github.com/taigaio/taiga-front-dist.git I get a 404 page missing.

How do I update from 6.0.10-6-g8e9853b - preferably to 6.7.6 or later - or to taiga next?