fix: Fix cache dot visualization

[ritchie46]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 81.34%. Comparing base (9fec2ec) to head (6e48c49).

Files	Patch %	Lines
crates/polars-plan/src/dot.rs	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15311      +/-   ##
==========================================
- Coverage   81.34%   81.34%   -0.01%     
==========================================
  Files        1364     1364              
  Lines      176612   176615       +3     
  Branches     2526     2526              
==========================================
  Hits       143670   143670              
- Misses      32459    32461       +2     
- Partials      483      484       +1     

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