[ANN] Updating branching scheme to use "main"

[Tom Rini]

Hey all,

As part of migrating from source.denx.de and over to
git.u-boot-project.org, I think it's time to change the branching scheme
from master or next to main or next. Since we'll be changing the URLs, I
don't think we need to (and I'm not sure we can automatically) have a
period where both exist. Thanks!

-- 
Tom

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