Maintenance: Convert deprecated `set-output` command on Github Actions workflows

[rubenfonseca]

Summary

We need to convert all the calls to set-output commands to the new format: https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#setting-an-output-parameter

Why is this needed?

GH is deprecating set-output (no ETA yet): https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

Which area does this relate to?

Automation

Solution

No response

Acknowledgment

• This request meets Lambda Powertools Tenets
• Should this be considered in other Lambda Powertools languages? i.e. Java, TypeScript

[dreamorosi]

The deprecation now has a target date according to the linked page:

Starting 1st June 2023 workflows using save-state or set-output commands via stdout will fail with an error.

[github-actions]

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