chore(deps): update plugin com.diffplug.spotless to v6.18.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.diffplug.spotless	6.17.0 -> 6.18.0

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Configuration

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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (19a86a6) 77.66% compared to head (793b996) 77.66%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #160   +/-   ##
=======================================
  Coverage   77.66%   77.66%           
=======================================
  Files          30       30           
  Lines         703      703           
  Branches       94       94           
=======================================
  Hits          546      546           
  Misses        116      116           
  Partials       41       41           

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