Update TruffleRuby dev release URLs #2152
Merged
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The current truffleruby-dev builds are based on Ubuntu 18.04. Since Ubuntu 18.04 will be EOL in two months, we should switch over to Ubuntu 20.04 as our newest base.
Likewise, the truffleruby+graalvm-dev installation URLs broke because Java 19 was not an LTS release and there are no longer snapshot builds based on Java 19. While Java 20 builds are available, we should just use Java 17 as that's the most recent Java LTS. As such, those URLs will be more stable; they won't change until the next Java LTS release.