Bump lodash.mergewith from 4.6.1 to 4.6.2 in /SparkMonitor

Bumps [lodash.mergewith](https://github.com/lodash/lodash) from 4.6.1 to 4.6.2.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](https://github.com/lodash/lodash/commits

)

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