fix[tool]: remove duplicate quotes in subgraph labels which created a syntax error in the dot output

[crebsy]

What I did

The subgraph labels of the IR contain duplicate double quotes "" for the internal nodes which create a syntax error when parsing the generated output with graphviz. As a fix, I removed the duplicates so that the output only contains " now and can be used with graphviz again.

How I did it

Changed the string interpolation of the subgraph label

How to verify it

Run tests or manually pipe the compiler output cfg_runtime format into dot:

$ vyper -f cfg_runtime --venom test.vy | dot 

Commit message

fix[tool]: remove duplicate quotes in subgraph labels which created a syntax error in the dot output

Description for the changelog

Remove duplicate quotes in subgraph labels which created a syntax error in the dot output

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.94%. Comparing base (76d6a0f) to head (102cbaf).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4672      +/-   ##
==========================================
+ Coverage   92.92%   92.94%   +0.01%     
==========================================
  Files         131      131              
  Lines       18991    18991              
  Branches     3295     3295              
==========================================
+ Hits        17648    17651       +3     
  Misses        905      905              
+ Partials      438      435       -3     

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