Change permission for 'Get a downtime' endpoint (#1757)

Co-authored-by: ci.datadog-api-spec <packages@datadoghq.com>

Author: api-clients-generation-pipeline[bot]

.apigentools-info

@@ -4,13 +4,13 @@
     "spec_versions": {
         "v1": {
             "apigentools_version": "1.6.6",
-            "regenerated": "2023-11-10 07:21:09.943120",
-            "spec_repo_commit": "5d9edae7"
+            "regenerated": "2023-11-14 15:18:19.873863",
+            "spec_repo_commit": "b95546fe"
         },
         "v2": {
             "apigentools_version": "1.6.6",
-            "regenerated": "2023-11-10 07:21:09.956411",
-            "spec_repo_commit": "5d9edae7"
+            "regenerated": "2023-11-14 15:18:19.888396",
+            "spec_repo_commit": "b95546fe"
         }
     }
 }

.generator/schemas/v2/openapi.yaml

@@ -21116,7 +21116,7 @@ paths:
       - apiKeyAuth: []
         appKeyAuth: []
       - AuthZ:
-        - monitors_read
+        - monitors_downtime
       summary: Get a downtime
       tags:
       - Downtimes