Test suite fails for macOS due to missing Conda install

[keikoro]

See this issue (comment) s-weigand/setup-conda#432 (comment) in the action's repo.

[OsaAjani]

Thank you for your contributions and for reporting issues in this repository. With the release of v2, which introduces significant changes to the codebase and API, we’ve reviewed the backlog of open PRs and issues. Due to the length of the backlog and the likelihood that many of these are either fixed or no longer applicable, we’ve made the decision to close all previous PRs and issues.

If you believe that any of these are still relevant to the current version or if you'd like to reopen a related discussion, please feel free to create a new issue or pull request, referencing the old one.

Thank you for your understanding and continued support!