Bump lodash from 4.17.15 to 4.17.21 in /src/Web/WebSPA/Client

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.15 to 4.17.21.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](https://github.com/lodash/lodash/compare/4.17.15...4.17.21)

---
updated-dependencies:
- dependency-name: lodash
  dependency-type: direct:development
...

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