refactor requirements into own file with parent inheritance

[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 requirements to own file so they are recognized by Dependabot
closes #159

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.

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[codecov]

Codecov Report

Attention: Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.

Project coverage is 73%. Comparing base (3f96b5f) to head (ce022e1).

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #336   +/-   ##
===================================
+ Coverage    70%    73%   +2%     
===================================
  Files         2      2           
  Lines       405    405           
===================================
+ Hits        284    294   +10     
+ Misses      121    111   -10