Bump lodash from 4.17.14 to 4.17.20 in /lib/ui-toolkit (#83)

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.14 to 4.17.20.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.17.14...4.17.20)

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