Temporarily escalate @biglep to org owner

[BigLep]

Temporary org ownership is needed to complete #47

It enables me to

1. Access the (audit log)[https://docs.github.com/en/organizations/keeping-your-organization-secure/managing-security-settings-for-your-organization/reviewing-the-audit-log-for-your-organization] so I can be sure I'm not advocating for removing owner ownership of someone who has been very active on administering the org
2. Give the "github-mgmt Stewards" team moderator and security manager roles.

Access here will be revoked as part of completing #47, which should happen no later than the week of 2024-09-02.

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 biglep:
  - will have the role in the organization change from member to admin

[github-actions]

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

Terraform plans

filecoin-project

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

Terraform will perform the following actions:

  # github_membership.this["biglep"] will be updated in-place
  ~ resource "github_membership" "this" {
        id       = "filecoin-project:BigLep"
      ~ role     = "member" -> "admin"
        # (2 unchanged attributes hidden)
    }

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