Update static/app/views/detectors/components/details/cron/index.spec.tsx

Co-authored-by: Scott Cooper <scttcper@gmail.com>

Author: evanpurkhiser

static/app/views/detectors/components/details/cron/index.spec.tsx

@@ -370,7 +370,7 @@ describe('CronDetectorDetails - check-ins', () => {
       });
 
       const muteRequest = MockApiClient.addMockResponse({
-        url: `/projects/org-slug/${project.slug}/monitors/${detectorWithMultipleEnvs.dataSources[0].queryObj.slug}/environments/production`,
+        url: `/projects/org-slug/${project.slug}/monitors/${detectorWithMultipleEnvs.dataSources[0].queryObj.slug}/environments/production/`,
         method: 'PUT',
         body: {},
       });