Replace deprecated `hub` usage with `gh` in release workflow

[Jimmy Chen]

• The hub cli has been removed from the GitHub runners as of October 2, according to : actions/runner-images#8362

We should replace usage of hub in our release workflow (ideally before the next release), similar to Lighthouse #4839.

https://github.com/sigp/siren/blob/stable/.github/workflows/release.yml#L237

[antondlr]

fixed in #240