ci(renovate): don't automatically rebase PRs

[jmattheis]

We normally keep the PRs open for some time, this disables the auto rebasing, to reduce the spam of notifications. We can use the checkbox to rebase when we want to merge the PRs.

Another possible way would be enabling auto merging, but I generally like to glance over the changelog that will be merged. What do you think @eternal-flame-AD?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.46%. Comparing base (a1329c8) to head (bfdb07c).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #975   +/-   ##
=======================================
  Coverage   74.46%   74.46%           
=======================================
  Files          62       62           
  Lines        3008     3008           
=======================================
  Hits         2240     2240           
  Misses        605      605           
  Partials      163      163           

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[eternal-flame-AD]

Lgtm!