Update the JSON schemas

The command executed was as follows:
rm -f .api.deps .cli.deps && FETCH_APIS=1 make update-json -j8

etc/api/appengine/v1beta/appengine-api.json

@@ -1918,7 +1918,7 @@
             }
         }
     },
-    "revision": "20240226",
+    "revision": "20240415",
     "rootUrl": "https://appengine.googleapis.com/",
     "schemas": {
         "ApiConfigHandler": {
@@ -3541,8 +3541,9 @@
                     "type": "string"
                 },
                 "phase": {
+                    "description": "Phase indicates when in the container event propagation this event is being communicated. Events are sent before and after the per-resource events are propagated. required",
                     "enum": [
-                        "UNKNOWN",
+                        "CONTAINER_EVENT_PHASE_UNSPECIFIED",
                         "BEFORE_RESOURCE_HANDLING",
                         "AFTER_RESOURCE_HANDLING"
                     ],
@@ -3559,7 +3560,7 @@
                 },
                 "state": {
                     "$ref": "ContainerState",
-                    "description": "The state of the project that led to this event."
+                    "description": "The state of the organization that led to this event."
                 }
             },
             "type": "object"