Regenerate client from commit d72de97 of spec repo (#761)

Co-authored-by: ci.datadog-api-spec <[email protected]>

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

.apigentools-info

@@ -4,13 +4,13 @@
     "spec_versions": {
         "v1": {
             "apigentools_version": "1.5.1.dev2",
-            "regenerated": "2022-01-04 17:35:06.391445",
-            "spec_repo_commit": "a4fe6c9"
+            "regenerated": "2022-01-05 07:39:01.071781",
+            "spec_repo_commit": "d72de97"
         },
         "v2": {
             "apigentools_version": "1.5.1.dev2",
-            "regenerated": "2022-01-04 17:35:06.832539",
-            "spec_repo_commit": "a4fe6c9"
+            "regenerated": "2022-01-05 07:39:01.537546",
+            "spec_repo_commit": "d72de97"
         }
     }
 }

.generator/schemas/v1/openapi.yaml

@@ -1721,6 +1721,7 @@ components:
             description: A day of the week, formatted as `Mon`, `Tue`, `Wed`, `Thu`,
               `Fri`, `Sat` or `Sun`.
             type: string
+          nullable: true
           type: array
       type: object
     Event: