Admin: Automate IAM Managed Policies updates

.github/workflows/data-update_iam-managed-policies.yml

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+# Data Update:
+#   IAM Managed Policies
+#
+# This Github Action:
+#   - executes the script that updates the IAM Managed Policies that come bundled with Moto
+#   - creates a PR
+#
+name: "DataUpdate_IAMManagedPolicies"
+
+on:
+  schedule:
+    - cron: '00 6 1 * *'
+  workflow_dispatch:
+
+jobs:
+  update:
+    name: Update IAM Managed Policies
+    runs-on: ubuntu-latest
+    if: ${{ github.ref == 'refs/heads/master' && github.repository == 'getmoto/moto' }}
+    permissions:
+      id-token: write
+      contents: write
+      pull-requests: write
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Set up Python 3.9
+      uses: actions/setup-python@v5
+      with:
+        python-version: 3.9
+
+    - name: Pull IAM managed policies from AWS
+      run: |
+        pip install -r requirements-dev.txt
+        make aws_managed_policies
+    - name: Create PR
+      uses: peter-evans/create-pull-request@v5
+      with:
+        branch: 'chore-update-iam-managed-policies-${{ github.run_number }}'
+        title: 'chore: update IAM Managed Policies'
+        commit-message: 'chore: update IAM Managed Policies'