Add Kobzol to the leadership-council

[ehuss]

cc @rust-lang/leadership-council @Kobzol

[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/leadership-council':
      Adding member 'Kobzol' with member role
      Deleting member 'Mark-Simulacrum'
    📝 Editing team 'rust-lang-nursery/leadership-council':
      Adding member 'Kobzol' with member role
      Deleting member 'Mark-Simulacrum'
    📝 Editing team 'rust-lang/wg-triage':
      Adding member 'Hayden602' with member role