Max

### Is your proposal related to a problem? When working with a long running project I always find it frustrating when there are no migration changelogs. Depending on the circumstances...

# Changes - update checkout version to 4 - update setup-qemu-action to 3 - update setup-buildx-action to 3 - update upload-artifact to 3 - update download-artifact to 3

Lowest of the low hanging fruit, but this should make the GitHub action output a bit more useful. Didn't touch appveyor because I know too little about it. Also bumped...