fix: Do not treat triple-hyphen as a delimiter for open block

[scouten]

Fixes #146.

[codspeed-hq]

CodSpeed Performance Report

Merging #156 will not alter performance

_{Comparing fix-open-delimiter-block (09e2c14) with main (4752b19)}

Summary

✅ 4 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (4752b19) to head (09e2c14).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #156   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           25        25           
  Lines         1383      1383           
=========================================
  Hits          1383      1383           

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