Update actions/core dependency to 1.10.0

[jceresini]

Close #100.

Github actions is deprecating the set-output command, and this action will stop working at the end of the month. Here's the warning I've seen when we run this action:

Warning: 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/

According to that blog post, the issue is resolved in actions/core 1.10.0.

[jceresini]

Also from the blog post, the note on when it will stop working:

We are monitoring telemetry for the usage of these commands and plan to fully disable them on 31st May 2023. Starting 1st June 2023 workflows using save-state or set-output commands via stdout will fail with an error.

[Lawls91]

@tibdex will this be merged before end of May? It seems that builds will start failing without this update

[tibdex]

Thanks