chore(deps): update vendored openapi spec

Author: renovate[bot]

.vendored/rootly-api/swagger.json

@@ -19395,7 +19395,7 @@
         "parameters": [],
         "responses": {
           "201": {
-            "description": "incident_status_page_event created",
+            "description": "incident_status_page_event created with started_at",
             "content": {
               "application/vnd.api+json": {
                 "schema": {
@@ -19549,7 +19549,7 @@
         "parameters": [],
         "responses": {
           "200": {
-            "description": "incident_status_page_event updated",
+            "description": "incident_status_page_event started_at updated",
             "content": {
               "application/vnd.api+json": {
                 "schema": {
@@ -70251,6 +70251,12 @@
                     "description": "For Statuspage.io integrated pages auto publishes a tweet for your update",
                     "default": false,
                     "nullable": true
+                  },
+                  "started_at": {
+                    "type": "string",
+                    "format": "date-time",
+                    "description": "When the event started. Defaults to the time of creation.",
+                    "nullable": true
                   }
                 },
                 "additionalProperties": false,
@@ -70316,6 +70322,12 @@
                     "description": "For Statuspage.io integrated pages auto publishes a tweet for your update",
                     "default": false,
                     "nullable": true
+                  },
+                  "started_at": {
+                    "type": "string",
+                    "format": "date-time",
+                    "description": "When the event started.",
+                    "nullable": true
                   }
                 },
                 "additionalProperties": false