Modern Android libraries are starting to phase out support for Android 5 (API levels 21 to 22). This makes sense to me since Android 6 was released 10 years ago.
Since a lot of libraries are no longer supporting Android 5 it means that to keep dependencies updated, Summit can no longer support Android 5 either.
If this is a huge concern to any users of Summit please flag in the comments. Otherwise I will be removing support for these versions of Android in the next release.
You could try to prompt those users to install lineage os. Thats an open source android version that can be installed on a lot of phones that can run android. There are some 9+ jear old devices that currently still get support