Use GITHUB_ENV instead of set-output

[jasminabrar]

• set-output command is to be deprecated soon

[codecov-commenter]

Codecov Report

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

Comparison is base (5fc980f) 72.75% compared to head (9c36fe6) 72.75%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #281 +/- ## ======================================= Coverage 72.75% 72.75% ======================================= Files 89 89 Lines 10900 10900 ======================================= Hits 7930 7930 Misses 2970 2970 ```

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