TCLOUD-4780: Update assumed role

The service was renamed to tinymce-docs and so the role was updated to
match.

Author: tiny-james

.github/workflows/preview_create.yml

@@ -54,8 +54,8 @@ jobs:
     - name: configure aws credentials
       uses: aws-actions/[email protected]
       with:
-        role-to-assume: arn:aws:iam::327995277200:role/staging-docs-preview-update
-        role-session-name: docs-preview-update
+        role-to-assume: arn:aws:iam::327995277200:role/staging-tinymce-docs-update
+        role-session-name: tinymce-docs-update
         aws-region: us-east-1
 
     - name: Upload website preview to S3