Grant gui wg push to gateway checker

[2color]

Summary

Grant push access to the gateway checker

Why do you need this?

This came up with this PR: ipfs/public-gateway-checker#331

[github-actions]

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

Terraform plans

ipfs

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_team_repository.this["WG GUI/UX:public-gateway-checker"] will be updated in-place
  ~ resource "github_team_repository" "this" {
        id         = "2825335:public-gateway-checker"
      ~ permission = "pull" -> "push"
        # (3 unchanged attributes hidden)
    }

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