Bump @mozilla-protocol/core from 18.0.0 to 21.1.0

Bumps [@mozilla-protocol/core](https://github.com/mozilla/protocol) from 18.0.0 to 21.1.0.
- [Release notes](https://github.com/mozilla/protocol/releases)
- [Changelog](https://github.com/mozilla/protocol/blob/main/CHANGELOG.md)
- [Commits](mozilla/protocol@v18.0.0...v21.1.0)

---
updated-dependencies:
- dependency-name: "@mozilla-protocol/core"
  dependency-version: 21.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package-lock.json

@@ -24,7 +24,7 @@
   "dependencies": {
     "@babel/core": "^7.24.6",
     "@babel/preset-env": "^7.24.6",
-    "@mozilla-protocol/core": "^18.0.0",
+    "@mozilla-protocol/core": "^21.1.0",
     "@mozmeao/dnt-helper": "^1.0.0",
     "babel-loader": "^9.1.2",
     "clean-webpack-plugin": "^4.0.0",