chore: rename default branch to 'main'

[mavimo]

This is a PR to propose to move the default branch to main as GH propose for new repos:

https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/about-branches#about-the-default-branch

NB: please do not merge until the default branch is renamed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (cafb53c) 42.19% compared to head (57797f1) 42.19%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #184   +/-   ##
=======================================
  Coverage   42.19%   42.19%           
=======================================
  Files          12       12           
  Lines         365      365           
=======================================
  Hits          154      154           
  Misses        210      210           
  Partials        1        1           

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