Bump external/usersim from a7b1c28 to 497eeda (microsoft#3404)

Bumps [external/usersim](https://github.com/microsoft/usersim) from `a7b1c28` to `497eeda`.
- [Commits](microsoft/usersim@a7b1c28...497eeda)

---
updated-dependencies:
- dependency-name: external/usersim
  dependency-type: direct:production
...

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