Update dependency @sentry/ember to v8.21.0 (#9196)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -41,7 +41,7 @@
   },
   "dependencies": {
     "@juggle/resize-observer": "3.4.0",
-    "@sentry/ember": "8.20.0",
+    "@sentry/ember": "8.21.0",
     "chart.js": "4.4.3",
     "date-fns": "3.6.0",
     "highlight.js": "11.10.0",