There aren’t any further outstanding PRs which are ready to be applied to 3.7. There are a number of open PRs which cannot be applied to 3.7 due to breaking backwards compatibility. Now that 3.7.22 is released, I’d like to move V3 development on to 3.8.
Unless there is an urgent need to backport a bug fix to 3.7, 3.7.22 will be the last 3.7 release.