* tests: use stable MAS integration in Synapse
* Automatically follow MAS main branch
* Update the pinned Synapse container image to latest develop
* Update element-web-playwright-common to 1.4.5
* Fix the typing of the MAS config
* Update playwright-common to 1.4.6
* Use the modern MAS -> Synapse API
* Relax MAS rate limiting
* Revert using the modern API explicitly, it is now the default
* Better adjust the MAS rate limits