Bump sha.js and web-ext

Removes [sha.js](https://github.com/crypto-browserify/sha.js). It's no longer used after updating ancestor dependency [web-ext](https://github.com/mozilla/web-ext). These dependencies need to be updated together.


Removes `sha.js`

Updates `web-ext` from 8.2.0 to 8.9.0
- [Release notes](https://github.com/mozilla/web-ext/releases)
- [Commits](https://github.com/mozilla/web-ext/compare/8.2.0...8.9.0)

---
updated-dependencies:
- dependency-name: sha.js
  dependency-version: 
  dependency-type: indirect
- dependency-name: web-ext
  dependency-version: 8.9.0
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -38,7 +38,7 @@
     "ts-loader": "^9.4.2",
     "ts-node": "^10.9.1",
     "typescript": "4.9",
-    "web-ext": "^8.2.0",
+    "web-ext": "^8.9.0",
     "webpack": "^5.94.0",
     "webpack-cli": "^4.10.0",
     "webpack-merge": "^5.8.0"