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I actually suggest creating a 21.11.x branch to merge this one into.
Ideally, the "master" branch should have the latest code, and then older branches should be made for older maintenance versions of the plugin code if necessary.
Alternatively, you can just use the "Releases" to provide an archive of plugin packages for older versions. That's probably the simplest way to go.
You can see an example release at https://github.com/minusdavid/openathens-koha-plugin/releases/tag/v21.11.x-1