Bump third_party/libdatachannel/repo from 59ce380 to a318f07 (#38088)

Bumps [third_party/libdatachannel/repo](https://github.com/paullouisageneau/libdatachannel) from `59ce380` to `a318f07`.
- [Release notes](https://github.com/paullouisageneau/libdatachannel/releases)
- [Commits](paullouisageneau/libdatachannel@59ce380...a318f07)

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

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