Upgrade: Bump gulp-brotli from 2.0.2 to 3.0.0

Bumps [gulp-brotli](https://github.com/seznam/gulp-brotli) from 2.0.2 to 3.0.0.
- [Release notes](https://github.com/seznam/gulp-brotli/releases)
- [Commits](seznam/gulp-brotli@v2.0.2...v3.0.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

package.json

@@ -25,7 +25,7 @@
     "cross-env": "^7.0.0",
     "eslint": "^7.0.0",
     "gulp": "^4.0.2",
-    "gulp-brotli": "^2.0.2",
+    "gulp-brotli": "^3.0.0",
     "gulp-changed": "^4.0.2",
     "gulp-clean-css": "^4.2.0",
     "gulp-cli": "^2.2.0",