Remove left members

[Crow314]

脱退済みメンバーに毎回 Invitation が飛んでいるので、Terraformから削除

[github-actions]

Terraform Plan

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_membership.member["kino-ma"] will be created
  + resource "github_membership" "member" {
      + etag     = (known after apply)
      + id       = (known after apply)
      + role     = "member"
      + username = "kino-ma"
    }

  # github_team_members.team_member["ictsc2025"] will be updated in-place
  ~ resource "github_team_members" "team_member" {
        id      = "12998717"
        # (2 unchanged attributes hidden)

      + members {
          + role     = "member"
          + username = "amechun"
        }
      + members {
          + role     = "member"
          + username = "aoi96"
        }
      + members {
          + role     = "member"
          + username = "kino-ma"
        }

        # (28 unchanged blocks hidden)
    }

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

─────────────────────────────────────────────────────────────────────────────

Note: You didn't use the -out option to save this plan, so Terraform can't
guarantee to take exactly these actions if you run "terraform apply" now.