Wrong default branch

Problem/Motivation

When browsing to https://git.drupalcode.org/project/gtm, you land on the master branch which only contains an old commit. This is a bit confusing for people that want to have a look at the code of the module.
The default branch should probably be 8.x-1.x.

Steps to reproduce

Click on "Source code" or "Commit log" on https://www.drupal.org/project/gtm → .

Proposed resolution

You can change the default branch in the repository settings: https://git.drupalcode.org/project/gtm/-/settings/repository#branch-defa...

Remaining tasks

User interface changes

API changes

Data model changes