[Security] Bump extend from 3.0.1 to 3.0.2 in /build

Bumps [extend](https://github.com/justmoon/node-extend) from 3.0.1 to 3.0.2. **This update includes security fixes.**
- [Release notes](https://github.com/justmoon/node-extend/releases)
- [Changelog](https://github.com/justmoon/node-extend/blob/master/CHANGELOG.md)
- [Commits](https://github.com/justmoon/node-extend/compare/v3.0.1...v3.0.2

)

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