semantic-release using 'main' branch

- semantic-release issue for adding 'main' as an alternative default branch - https://github.com/semantic-release/semantic-release/issues/1581/
- dr-scripts change to revert after semantic-release adds 'main' as an alternative default branch - https://github.com/dustin-ruetz/dr-scripts/commit/f9a0737a9182a8c3e7687e24bd87900bba793898/