Fix typehint of traversal_rules

[agoscinski]

The code is crap. I just don't want to forget this issue. I think API break is kind of needed, it's a wrong type hint.

[coderabbitai]

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[codecov]

Codecov Report

❌ Patch coverage is 96.42857% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 80.70%. Comparing base (92c21cc) to head (98dd0ba).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
src/aiida/tools/graph/graph_traversers.py	85.72%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7597      +/-   ##
==========================================
- Coverage   80.70%   80.70%   -0.00%     
==========================================
  Files         581      581              
  Lines       47138    47157      +19     
==========================================
+ Hits        38040    38053      +13     
- Misses       9098     9104       +6     

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