As per our release schedule the mentioned versions will go into security-only support mode. A last round of bugfix releases for Flow was just done: Flow bugfix releases: 6.3.20, 7.0.17, 7.1.12, 7.2.9, 7.3.7 & 8.0.5 – releases of Neos are currently on their way.
From now on those versions will still receive security fixes for one more year and run into EOL by August 2023.
Be sure to upgrade your projects to at least 7.3 a.k.a. “White Rabbit” within this timeframe!
For new (non-security) pull requests created the lowest version to target should be 7.3 in the flow-development-collection and the neos-development-collection.