[4.0][Testing] Updating drone.yml to always update JoomlaBrowser

Updating JoomlaBrowser to the newest version for every test run.

.drone.yml

@@ -28,6 +28,7 @@ pipeline:
       # needed for system testing
       - composer update joomla/test-system --no-progress --no-suggest
       - composer update joomla-projects/selenium-server-standalone --no-progress --no-suggest
+      - composer update joomla-projects/joomla-browser --no-progress --no-suggest
       - npm install --unsafe-perm
 
   rebuild-cache: