fix(ember): Use updated version for clean-css (#17979)

[Ember E2E tests
fail](https://github.com/getsentry/sentry-javascript/actions/runs/18656635954/job/53191164591)
with `util.isRegExp is not a function`. Apparently, this is a JSDoc/Node
issue that was already resolved last year:
jsdoc/jsdoc#2126

It is happening since the tests run with Node 24.10.0 instead of
22.20.0. The `isRegExp` API was removed from Node, so I updated the
`clean-css` package as it's mentioned in the error stack. However, it
could be that we either need to update `ember-cli` or just downgrade the
node version for this test.

Author: s1gr1d

dev-packages/e2e-tests/test-applications/ember-classic/package.json

@@ -75,7 +75,8 @@
     "node": ">=18"
   },
   "resolutions": {
-    "@babel/traverse": "~7.25.9"
+    "@babel/traverse": "~7.25.9",
+    "clean-css": "^5.3.0"
   },
   "ember": {
     "edition": "octane"