docker-compose.selenium-chrome.yaml: the attribute `version` is obsolete,

[finnlewis]

On a fresh install, we see this:

time="2025-09-10T18:01:30+01:00" level=warning msg="/Users/finn/sites/l.microsites/MICRO_PROJECT/.ddev/docker-compose.selenium-chrome.yaml: the attribute `version` is obsolete, it will be ignored, please remove it to avoid potential confusion" 

Indeed the originating file no longer has the version: https://github.com/ddev/ddev-selenium-standalone-chrome/blob/main/docker-compose.selenium-chrome.yaml