GitLab

Bumps [actions/stale](https://github.com/actions/stale) from v3.0.14 to v3.0.15.
- [Release notes](https://github.com/actions/stale/releases)
- [Commits](https://github.com/actions/stale/compare/v3.0.14...86561461b92875de77a8b2d2e75f004c826e8f45

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