They could all be replaced in your workflow fairly easily if you don't want to include them.
sample-group-sanity-check is just a fast fail for if someone forgot to update the group id away from the sample project. Once you've changed that you can remove it.
read-property just reads the version name from gradle.properties. There are likely other actions out there, or could be done manually
update-release is git commands to update the release after kmmbridge is finished uploading. This is needed, but could probably be inlined rather than using the custom action
All that said, I'll also look into bumping the versions