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/networksecurity/v1beta1/networksecurity-api.json

@@ -3162,7 +3162,7 @@
             }
         }
     },
-    "revision": "20240221",
+    "revision": "20240320",
     "rootUrl": "https://networksecurity.googleapis.com/",
     "schemas": {
         "AddAddressGroupItemsRequest": {
@@ -3535,6 +3535,10 @@
                     "readOnly": true,
                     "type": "string"
                 },
+                "disabled": {
+                    "description": "Optional. Whether the association is disabled. True indicates that traffic won't be intercepted",
+                    "type": "boolean"
+                },
                 "firewallEndpoint": {
                     "description": "Required. The URL of the FirewallEndpoint that is being associated.",
                     "type": "string"