RFR: 8295714: GHA ::set-output is deprecated and will be removed [v2]

[Magnus Ihse Bursie]

On Fri, 21 Oct 2022 07:39:49 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> We need to transition to use the new `$GITHUB_OUTPUT` method instead. 
>> 
>> This needs to be fixed since it is currently spamming the summary with warnings, and will stop working soon.
>
> Magnus Ihse Bursie has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Upgrade to download-artifact at v3.0.1

*digging some more* 

Actually, the `v3` tag is already identical to `v3.0.1`, so there's probably just some caching at work here. I'll revert the latest commit, and then I say we're good to go. The upload-artifact issue will resolve itself, eventually, and we do not need to delay this fix awaiting that.

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PR: https://git.openjdk.org/jdk/pull/10785