ci: Use GITHUB_OUTPUT envvar instead of set-output command

[arunsathiya]

save-state and set-output commands used in GitHub Actions are deprecated and GitHub recommends using environment files.

This PR updates the usage of ::set-output to "$GITHUB_OUTPUT"

Instructions for envvar usage from GitHub docs:

https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#setting-an-output-parameter

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (cab389a) 79.49% compared to head (a428b78) 79.49%. Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #6754 +/- ## ======================================= Coverage 79.49% 79.49% ======================================= Files 218 218 Lines 19141 19141 Branches 2465 2465 ======================================= Hits 15216 15216 Misses 3894 3894 Partials 31 31 ```

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