chore(deps): update dependency org.apache.maven.plugins:maven-site-plugin to v3.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.apache.maven.plugins:maven-site-plugin	3.9.1 -> 3.21.0

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[codecov-commenter]

Codecov Report

Base: 15.89% // Head: 15.89% // No change to project coverage 👍

Coverage data is based on head (849be06) compared to base (1aa0722).
Patch has no changes to coverable lines.

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Additional details and impacted files

@@            Coverage Diff            @@
##             master     #312   +/-   ##
=========================================
  Coverage     15.89%   15.89%           
  Complexity       76       76           
=========================================
  Files            33       33           
  Lines          1302     1302           
  Branches        125      125           
=========================================
  Hits            207      207           
  Misses         1082     1082           
  Partials         13       13           

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