Bump third_party/libwebsockets/repo from 4144c1e to 18fdb0d (#29780)

Bumps [third_party/libwebsockets/repo](https://github.com/warmcat/libwebsockets) from `4144c1e` to `18fdb0d`.
- [Commits](warmcat/libwebsockets@4144c1e...18fdb0d)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]