Bumps spotbugs to [v4.2.3](https://github.com/spotbugs/spotbugs/blob/4.2.3/CHANGELOG.md) and assorted build dependencies (!96)
Bumps spotbugs to [v4.2.3](https://github.com/spotbugs/spotbugs/blob/4.2.3/CHANGELOG.md) and assorted build dependencies (!96)