add lcnr as impl trait project lead

[lcnr]

cc @oli-obk @nikomatsakis

Given my involvement there while working on the new solver :>

[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 crates-io
[INFO  sync_team] synchronizing github
[INFO  sync_team] 💻 Team Diffs:
    📝 Editing team 'rust-lang/initiative-impl-trait':
      Adding member 'lcnr' with member role
    💻 Repo Diffs:
    📝 Editing repo 'rust-lang/bors':
      Rulesets:
          Ruleset for main
            No changes

[jackh726]

Actually - technically needs approval by Niko. I'm quite tempted to just merge anyways, but I'll be a good boy and do it properly.

[nikomatsakis]

Good boy Jack