Bump third_party/libdatachannel/repo from 6fa7cff to 173d97a (project-chip#37607)

Bumps [third_party/libdatachannel/repo](https://github.com/paullouisageneau/libdatachannel) from `6fa7cff` to `173d97a`.
- [Release notes](https://github.com/paullouisageneau/libdatachannel/releases)
- [Commits](paullouisageneau/libdatachannel@6fa7cff...173d97a)

---
updated-dependencies:
- dependency-name: third_party/libdatachannel/repo
  dependency-type: direct:production
...

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