`UNITY_LICENSE` activation way works with test runner 4.0.0, but not in later v4 releases

[anatawa12]

Bug description
UNITY_LICENSE activation way works with test runner 4.0.0, but not in later v4 releases

How to reproduce
Run tests with following configuration. this works.

      - uses: game-ci/unity-test-runner@v4.0.0
        env:
          UNITY_LICENSE: ${{ secrets.UNITY_LICENSE }}

replacing @v4.0.0 with @v4 become error with No valid license activation strategy could be determined. Make sure to provide UNITY_EMAIL, UNITY_PASSWORD, and either a UNITY_SERIAL or UNITY_LICENSE. Otherwise please use UNITY_LICENSING_SERVER.

Expected behavior

No error since 4.0.0 works

Additional details

this is breaking changes must not be occur in same major version. I believe UNITY_LICENSE is safer than exposing raw credential so I prefer UNITY_LICENSE over password
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