MAINT: Upgrade Maven build

[carlwilson]

• removed some redundant plugin declarations; and
• bumped versions of various dependencies:
  • Izpack -> 5.2;
  • maven-clean-plugin -> 3.3.2;
  • maven-compiler-plugin -> 3.12.1;
  • maven-dependency-plugin -> 3.6.1;
  • maven-site-plugin -> 4.0.0-M13;
  • maven-javadoc-plugin -> 3.6.3;
  • maven-surefire-plugin -> 3.2.5;
  • maven-jacoco-plugin -> 0.8.11;
  • jaxb -> 1.4;
  • junit -> 5.10.2 via vintage engine.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 47.00%. Comparing base (8a4d1ce) to head (39630ba). Report is 3 commits behind head on integration.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## integration #903 +/- ## ================================================== + Coverage 30.15% 47.00% +16.85% - Complexity 651 1100 +449 ================================================== Files 57 57 Lines 9079 9079 Branches 1622 1622 ================================================== + Hits 2738 4268 +1530 + Misses 5965 4280 -1685 - Partials 376 531 +155 ```

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