build(web): pull in threadnet-call-embedded 0.19.2-threadnet.9

The .8 widget broke unmuting in production (both with the AI filter on and off);
threadnet-call dcc8643 restores the upstream off-path and hard-gates the feature
until the webAudioMix decision. Verified locally end to end: the installed
package carries the model assets, webpack lands them under
webapp/widgets/element-call/assets/dfn3, and the widget index.html references
the .9 bundle (0.19.2-threadnet.9+dcc86431).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/web/package.json

@@ -125,7 +125,7 @@
         "@babel/preset-react": "^7.12.10",
         "@babel/preset-typescript": "^7.12.7",
         "@casualbot/jest-sonar-reporter": "2.7.0",
-        "@sorb/threadnet-call-embedded": "0.19.2-threadnet.8",
+        "@sorb/threadnet-call-embedded": "0.19.2-threadnet.9",
         "@element-hq/element-web-playwright-common": "workspace:*",
         "@fetch-mock/jest": "^0.2.20",
         "@jest/globals": "^30.2.0",