add zoxc to wg-compiler-performance

[lqd]

@Zoxc has been doing a lot of great work on compiler performance recently. And this will also help them continue to do that more easily with access to try, the perfbot, and the >= 32 cores dev desktop machines.

r? @Mark-Simulacrum

[github-actions]

Dry-run check results

[2025-03-22T07:00:33Z WARN  sync_team] sync-team is running in dry mode, no changes will be applied.
[2025-03-22T07:00:33Z INFO  sync_team] synchronizing github
[2025-03-22T07:02:57Z INFO  sync_team] 💻 Team Diffs:
    📝 Editing team 'rust-lang/wg-compiler-performance':
      Adding member 'Zoxc' with member role

[Mark-Simulacrum]

Thanks!