This eliminates warnings about outdated node runtimes in GitHub Actions.
actions/download-artifact and actions/upload-artifact are the only ones
with any potential breaking changes, and adjustments have been made and
tested.
See
https://github.com/actions/upload-artifact/blob/main/docs/MIGRATION.md
Now that we are building tools to keep common workflows in sync across
repos, we should use the same names across repos. This brings Shaka
Player workflow names in line with everything else.
See https://github.com/joeyparrish/shaka-github-tools/pull/5