Add dependency info to CONTRIBUTING

[kingthorin]

Follow-up to: #1249

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.85%. Comparing base (b37c566) to head (2ff5280).
Report is 164 commits behind head on main.

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Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1253      +/-   ##
============================================
- Coverage     92.35%   91.85%   -0.50%     
- Complexity     2821     3064     +243     
============================================
  Files           292      310      +18     
  Lines          5609     5990     +381     
  Branches        599      625      +26     
============================================
+ Hits           5180     5502     +322     
- Misses          275      325      +50     
- Partials        154      163       +9     

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[kingthorin]

Accepted that suggestion. Good to go?