Require masterminds/html5 ^2.7 for ScraperTest compatibility

The Scraper tool tests require a newer version of masterminds/html5
to work correctly in the monorepo CI environment.

Author: OskarStark

src/agent/composer.json

@@ -33,6 +33,7 @@
         "symfony/type-info": "^7.3|^8.0"
     },
     "require-dev": {
+        "masterminds/html5": "^2.7",
         "mrmysql/youtube-transcript": "^0.0.5",
         "nyholm/psr7": "^1.8",
         "php-http/discovery": "^1.19",