[Synthetics] unskip edit_monitor api integration tests (elastic#141277)…

… (elastic#141415)

* Update edit_monitor.ts

* Update x-pack/test/api_integration/apis/uptime/rest/edit_monitor.ts

(cherry picked from commit 229dff5)

Co-authored-by: Dominique Clarke <dominique.clarke@elastic.co>

x-pack/test/api_integration/apis/uptime/rest/edit_monitor.ts

@@ -16,8 +16,7 @@ import { getFixtureJson } from './helper/get_fixture_json';
 import { PrivateLocationTestService } from './services/private_location_test_service';
 
 export default function ({ getService }: FtrProviderContext) {
-  // Failing: See https://github.com/elastic/kibana/issues/140520
-  describe.skip('[PUT] /internal/uptime/service/monitors', function () {
+  describe('[PUT] /internal/uptime/service/monitors', function () {
     this.tags('skipCloud');
 
     const supertest = getService('supertest');