update maven-javadoc-plugin config to use java.version

[codecov[bot]]

Codecov Report

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

Comparison is base (c6b25ab) 75.62% compared to head (b6fc7e3) 75.62%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #398 +/- ## ========================================= Coverage 75.62% 75.62% Complexity 1175 1175 ========================================= Files 76 76 Lines 5239 5239 Branches 747 747 ========================================= Hits 3962 3962 Misses 948 948 Partials 329 329 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.