forge's main branch is still called 'master'

[ckerr]

Pre-flight checklist

• [X] I have read the contribution documentation for this project.
• [X] I agree to follow the code of conduct that this project uses.
• [X] I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Problem description

Should be 'main'

Proposed solution

Rename to 'main'

Alternatives considered

n/a

Additional information

No response