req: shift defaults to parent

[Borda]

Before submitting

• Was this discussed/approved via a Github issue? (no need for typos and docs improvements)
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

move default requirements to the book's root

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in Github issues there's a high chance it will not be merged.

Did you have fun?

Make sure you had fun coding 🙃

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70%. Comparing base (49d57e9) to head (da3cb05).

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #338   +/-   ##
===================================
  Coverage    70%    70%           
===================================
  Files         2      2           
  Lines       413    413           
===================================
  Hits        291    291           
  Misses      122    122