CI: update referenced action versions

[AlexCuse]

There are some warnings in CI about node 12 deprecation and forced updates, eg:

https://github.com/keratin/authn-server/actions/runs/7270466443

Referenced actions can probably be easily updated to latest versions.

[AlexCuse]

The create-release and upload-release-asset actions are unmaintained. These usages will need to be migrated to https://github.com/softprops/action-gh-release which is noted as a replacement in READMEs for both.