chore: add Darius to rust-libp2p

[jxs]

Summary

Add @dariusc93 to the rust-libp2p maintainers

[github-actions]

The following access changes will be introduced as a result of applying the plan:

Access Changes

There will be no access changes

[github-actions]

Before merge, verify that all the following plans are correct. They will be applied as-is after the merge.

Terraform plans

libp2p

Terraform used the selected providers to generate the following execution
plan. Resource actions are indicated with the following symbols:
  + create

Terraform will perform the following actions:

  # github_team_membership.this["rust-libp2p active maintainers:dariusc93"] will be created
  + resource "github_team_membership" "this" {
      + etag     = (known after apply)
      + id       = (known after apply)
      + role     = "member"
      + team_id  = "9704050"
      + username = "dariusc93"
    }

Plan: 1 to add, 0 to change, 0 to destroy.