Bump ref/SteamClient from ba8c568 to c673c8a

Bumps [ref/SteamClient](https://github.com/BeyondDimension/SteamClient) from `ba8c568` to `c673c8a`.
- [Release notes](https://github.com/BeyondDimension/SteamClient/releases)
- [Commits](BeyondDimension/SteamClient@ba8c568...c673c8a)

---
updated-dependencies:
- dependency-name: ref/SteamClient
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>