[Security] Bump lodash.mergewith in /angular/pipes/pure-impure

Bumps [lodash.mergewith](https://github.com/lodash/lodash) from 4.6.1 to 4.6.2. **This update includes a security fix.**
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](https://github.com/lodash/lodash/commits)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]