build(deps-dev): bump @types/webextension-polyfill from 0.10.7 to 0.12.1

Bumps [@types/webextension-polyfill](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/webextension-polyfill) from 0.10.7 to 0.12.1.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/webextension-polyfill)

---
updated-dependencies:
- dependency-name: "@types/webextension-polyfill"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package.json

@@ -9,7 +9,7 @@
   },
   "devDependencies": {
     "@types/turndown": "^5.0.5",
-    "@types/webextension-polyfill": "^0.10.7",
+    "@types/webextension-polyfill": "^0.12.1",
     "@typescript-eslint/eslint-plugin": "^7.16.1",
     "autoprefixer": "^10.4.20",
     "cssnano": "^7.0.6",