Bump merge from 1.2.1 to 2.1.1 in /src/Web/WebSPA/Client

Bumps [merge](https://github.com/yeikos/js.merge) from 1.2.1 to 2.1.1.
- [Release notes](https://github.com/yeikos/js.merge/releases)
- [Commits](https://github.com/yeikos/js.merge/compare/v1.2.1...v2.1.1)

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

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