Update dependency org.apache.maven.plugins:maven-site-plugin to v3.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
org.apache.maven.plugins:maven-site-plugin (source)	3.8.2 → 3.21.0

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[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (261fa4b) 100.00% compared to head (d8fbb2b) 100.00%.
Report is 2 commits behind head on master.

❗ Current head d8fbb2b differs from pull request most recent head 93548b4. Consider uploading reports for the commit 93548b4 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##              master       #85   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       700       700           
===========================================
  Files             61        61           
  Lines           1213      1213           
  Branches           2         2           
===========================================
  Hits            1213      1213           

Flag	Coverage Δ
unitlinuxopenjdk10	100.00% <ø> (ø)
unitlinuxopenjdk11	100.00% <ø> (ø)
unitlinuxopenjdk12	100.00% <ø> (ø)

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

No Coverage information
0.0% Duplication

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

No Coverage information
0.0% Duplication

The version of Java (10.0.2) you have used to run this analysis is deprecated and we will stop accepting it from October 2020. Please update to at least Java 11.
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