Fabrízio de Royes Mello 332dffeebc Rename master branch to main
Following what many communities already did we agreed in renaming the
`master` branch to `main`.

Resources:
- https://sfconservancy.org/news/2020/jun/23/gitbranchname/
- https://postgr.es/m/20200615182235.x7lch5n6kcjq4aue@alap3.anarazel.de

Closes #4163
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