Add Darksonn to wg-triage.toml

[Darksonn]

This is so that I have the ability to modify tracking issues and add new links or tags to them. Using wg-triage for this was suggested to me by @jyn514.

[github-actions]

Dry-run check results

[WARN  sync_team] sync-team is running in dry mode, no changes will be applied.
[INFO  sync_team] synchronizing github
[INFO  sync_team] 💻 Team Diffs:
    📝 Editing team 'rust-lang/wg-triage':
      Adding member 'Darksonn' with member role
    💻 Repo Diffs:
    📝 Editing repo 'rust-lang/rustlings':
      New homepage: 'https://rustlings.rust-lang.org' => 'https://rustlings.cool'

[jieyouxu]

cc @Dylan-DPC