set-output is deprecated

[cam4phor]

Hi,

Github has deprecated the "set-output" command and it is throwing a warning. Can you please look into it before anything breaks.

Thanks.

[adamstankiewicz]

Based on the GitHub documentation about the deprecated set-output command, it appears just upgrading @actions/core to v1.10.0 should resolve the depreciation warning: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

I've opened a PR to do this upgrade for this workflow here: #73

cc @cam4phor