chore: add rvagg as code-owner in curio

[rjan90]

Summary

Add rvagg as code-owner in curio. Ref: https://filecoinproject.slack.com/archives/C08TVNKJV7C/p1779956569108749

Reviewer's Checklist

• It is clear where the request is coming from (if unsure, ask)
• All the automated checks passed
• The YAML changes reflect the summary of the request
• The Terraform plan posted as a comment reflects the summary of the request

[github-actions]

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

Access Changes

User rvagg:
  - will have the permission to curio change from push to admin
  - will gain admin permission to apt

[github-actions]

Before merge, verify that all the following plans are correct. After merge, Apply will regenerate the plans from the merged commit and continue only if they match.

Terraform plans

filecoin-project

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

Terraform will perform the following actions:

  # github_team_membership.this["curio:lexluthr"] will be updated in-place
  ~ resource "github_team_membership" "this" {
        id       = "10173236:LexLuthr"
      ~ role     = "member" -> "maintainer"
        # (3 unchanged attributes hidden)
    }

  # github_team_membership.this["curio:rvagg"] will be created
  + resource "github_team_membership" "this" {
      + etag     = (known after apply)
      + id       = (known after apply)
      + role     = "member"
      + team_id  = "10173236"
      + username = "rvagg"
    }

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

[LexLuthr]

Thank you! This is is great.