Bump findsecbugs-plugin from 1.8.0 to 1.9.0

Bumps [findsecbugs-plugin](https://github.com/find-sec-bugs/find-sec-bugs) from 1.8.0 to 1.9.0.
- [Release notes](https://github.com/find-sec-bugs/find-sec-bugs/releases)
- [Changelog](https://github.com/find-sec-bugs/find-sec-bugs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/find-sec-bugs/find-sec-bugs/commits

)

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