Bumps [actions/stale](https://github.com/actions/stale) from v3.0.15 to v3.0.16.
- [Release notes](https://github.com/actions/stale/releases)
- [Commits](https://github.com/actions/stale/compare/v3.0.15...9d6f46564a515a9ea11e7762ab3957ee58ca50da

)

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