Use the Preview version header on the SLA rules endpoints

Author: cathalging

descriptions/0/api.intercom.io.yaml

@@ -23438,7 +23438,7 @@ paths:
       - name: Intercom-Version
         in: header
         schema:
-          "$ref": "#/components/schemas/intercom_version"
+          "$ref": "#/components/schemas/intercom_version_preview"
       tags:
       - SLA Rules
       operationId: listSlaRules
@@ -23513,7 +23513,7 @@ paths:
       - name: Intercom-Version
         in: header
         schema:
-          "$ref": "#/components/schemas/intercom_version"
+          "$ref": "#/components/schemas/intercom_version_preview"
       - name: id
         in: path
         required: true