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Update related pull requests automatically when the base branch is updated

When terraform plan or tfmigrate plan are run in the target A, tfaction sets a pull request label A.

When a pull request of the target A is merged and terraform apply or tfmigrate apply are run in the target A, tfaction updates pull request breanches which have a pull request label A by GitHub API.

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By updating pull request branch, the result of CI including uploaded Terraform Plan file is updated. Otherwise, an uploaded Terraform Plan file becomes stale and it would fail to run terraform apply.