Add @nia-e to goal-owners

[nxsaken]

rust-lang/goals#752

[github-actions]

Dry-run check results

[WARN  rust_team::sync] sync-team is running in dry mode, no changes will be applied.
[INFO  rust_team::sync] synchronizing crates-io
[INFO  rust_team::sync] synchronizing github
[INFO  rust_team::sync] 💻 Team Diffs:
    📝 Editing team 'rust-lang/goal-owners':
      Adding member 'nia-e' with member role
    💻 Repo Diffs:
    📝 Editing repo 'rust-lang/rust-bindgen':
      Environments:
        ❌ Delete: copilot