Populate the Bifrost team

[galargh]

This PR adds @gmasgras, @mcamou and @thattommyhall to https://github.com/orgs/libp2p/teams/bifrost

Adding them didn't work before - #15 - because they were not members of the libp2p organization.

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

  # github_membership.this["mcamou"] will be created
  + resource "github_membership" "this" {
      + etag     = (known after apply)
      + id       = (known after apply)
      + role     = "member"
      + username = "mcamou"
    }

  # github_membership.this["thattommyhall"] will be created
  + resource "github_membership" "this" {
      + etag     = (known after apply)
      + id       = (known after apply)
      + role     = "member"
      + username = "thattommyhall"
    }

  # github_team_membership.this["Bifrost → gmasgras"] will be created
  + resource "github_team_membership" "this" {
      + etag     = (known after apply)
      + id       = (known after apply)
      + role     = "member"
      + team_id  = "6201425"
      + username = "gmasgras"
    }

  # github_team_membership.this["Bifrost → mcamou"] will be created
  + resource "github_team_membership" "this" {
      + etag     = (known after apply)
      + id       = (known after apply)
      + role     = "member"
      + team_id  = "6201425"
      + username = "mcamou"
    }

  # github_team_membership.this["Bifrost → thattommyhall"] will be created
  + resource "github_team_membership" "this" {
      + etag     = (known after apply)
      + id       = (known after apply)
      + role     = "member"
      + team_id  = "6201425"
      + username = "thattommyhall"
    }

Plan: 6 to add, 0 to change, 0 to destroy.

Changes to Outputs:
  ~ team_membership = [
        # (64 unchanged elements hidden)
        {
            id    = "6201424:iceseer"
            index = "Alumni → iceseer"
        },
      + {
          + id    = "6201425:gmasgras"
          + index = "Bifrost → gmasgras"
        },
        {
            id    = "2562372:ipfsbot"
            index = "ci → ipfsbot"
        },
        # (68 unchanged elements hidden)
    ]

[galargh]

Adding them didn't work before - #15 - because they were not members of the libp2p organization.

It looks like it did issue the invitations though. So we just have to merge this to reflect it in the JSON configs.