Update policy to add new deployer role

[jhpyke]

Pull Request Objective

This piece of work is being tracked in
this
GitHub Issue.

This adds the new airflow deployment role to the allowed list of deployers for xhibit

Checklist

Note

Each items should be checked. Skipping below checks could delay your PR review!

• I have reviewed the style guide
  and ensured that my code complies with it
• All checks have passed (or override label applied, if I've
  used the override-static-analysis label, I've explained why)
• I have self-reviewed my code
• I have reviewed the checks and can attest they're as expected

Additional Comments

[github-actions]

Terraform Component 🧱: aws-analytical-platform-data-production-data-engineering-pipelines

Checkov 🛂: success

Trivy 🛂: success

Static Analysis Override Label 🏷️: false

Pusher: @jhpyke, Action: pull_request, Working Directory: terraform/aws/analytical-platform-data-production/data-engineering-pipelines, Workflow: Terraform, Marker: aws-analytical-platform-data-production-data-engineering-pipelines_static_analysis

[github-actions]

Terraform Component 🧱: aws-analytical-platform-data-production-data-engineering-pipelines

Terraform Initialization ⚙️: success

Terraform Validation 🤖: success

Terraform Plan 🛠️: success

Pusher: @jhpyke, Action: pull_request, Working Directory: terraform/aws/analytical-platform-data-production/data-engineering-pipelines, Workflow: Terraform, Marker: aws-analytical-platform-data-production-data-engineering-pipelines_plan

[julialawrence]

LGTM