Add ranger-ross to the cargo team

[ehuss]

cc @rust-lang/cargo @ranger-ross

[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/cargo':
      Adding member 'ranger-ross' with member role
    📝 Editing team 'rust-lang-nursery/cargo':
      Adding member 'ranger-ross' with member role
    📝 Editing team 'rust-lang/all':
      Adding member 'ranger-ross' with member role