Bump external/usersim from 5017e62 to ee55fba in the actions group (#181)

Bumps the actions group with 1 update: [external/usersim](https://github.com/microsoft/usersim).


Updates `external/usersim` from `5017e62` to `ee55fba`
- [Commits](microsoft/usersim@5017e62...ee55fba)

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

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