Bump third_party/libdatachannel/repo from a02b751 to a4d3211 (project-chip#42798)

Bumps [third_party/libdatachannel/repo](https://github.com/paullouisageneau/libdatachannel) from `a02b751` to `a4d3211`.
- [Release notes](https://github.com/paullouisageneau/libdatachannel/releases)
- [Commits](paullouisageneau/libdatachannel@a02b751...a4d3211)

---
updated-dependencies:
- dependency-name: third_party/libdatachannel/repo
  dependency-version: a4d3211da33bc1114ae50d2dd12f4186b67aaba4
  dependency-type: direct:production
...

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