Add .vscode/settings.json to .gitignore

[baseballyama]

This is a small PR, but I would like to add a VSCode setting when modifying documentation, but I don't want to commit this.
Therefore I updated .gitignore.

(Basically, I work with IntelliJ IDEA, but VSCode is sometimes more convenient for document editing.)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.77%. Comparing base (bdbaf25) to head (43d048a).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #7298   +/-   ##
=========================================
  Coverage     84.77%   84.77%           
  Complexity     3992     3992           
=========================================
  Files           578      578           
  Lines         12026    12026           
  Branches       2477     2477           
=========================================
  Hits          10195    10195           
  Misses          606      606           
  Partials       1225     1225           

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[detekt-ci]

	Warnings
⚠️	This PR is approved with no milestone set. If merged, it won't appear in the detekt release notes.

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