I think there's a small optimization that could be done by changing so we do not install the composer dev-requires for the browser test jobs. It's maybe a ten second win and the core job (quibble-for-mediawiki-core-browser-tests-only-vendor-mysql-php83) is almost under 2 minutes so this fix could be the thing that pulls it under the 2 minute mark.
00:00:29.302 INFO:quibble.commands:<<< Finish: Install composer dev-requires for vendor.git, in 10.117 s