Update usages of set-output in our github workflows

[chatton]

Summary of Bug

In our github workflows, we use set-output in several places, this is going to be deprecated and removed. Our actions display the following deprecation message.

The set-output command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

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