[Security] Bump lodash from 4.17.19 to 4.17.21 in /build

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.19 to 4.17.21. **This update includes a security fix.**
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](https://github.com/lodash/lodash/compare/4.17.19...4.17.21

)

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