Use match for statistics brain

[cdce8p]

Followup to #2832
While looking at it (after it was merged) I thought it might be a good case for match.

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.37%. Comparing base (2bca4f5) to head (4c8693b).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
astroid/brain/brain_statistics.py	85.71%	2 Missing ⚠️

❌ Your patch status has failed because the patch coverage (85.71%) is below the target coverage (100.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2835      +/-   ##
==========================================
- Coverage   93.37%   93.37%   -0.01%     
==========================================
  Files          92       92              
  Lines       11151    11148       -3     
==========================================
- Hits        10412    10409       -3     
  Misses        739      739              

Flag	Coverage Δ
linux	93.23% <85.71%> (-0.01%)	⬇️
pypy	93.37% <85.71%> (-0.01%)	⬇️
windows	93.35% <85.71%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
astroid/brain/brain_statistics.py	92.30% <85.71%> (-0.80%)	⬇️

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