Bump maven-shade-plugin from 1.6 to 3.2.4

Bumps [maven-shade-plugin](https://github.com/apache/maven-shade-plugin) from 1.6 to 3.2.4.
- [Release notes](https://github.com/apache/maven-shade-plugin/releases)
- [Commits](https://github.com/apache/maven-shade-plugin/compare/maven-shade-plugin-1.6...maven-shade-plugin-3.2.4)

Signed-off-by: dependabot[bot] <support@github.com>
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