Don't use merge commits in CI

[kuznetsss]

Currently out CI uses checkout action with default settings and by default for PRs it creates merge commit after checkout.
Because of this hash of commit which is not in our repo goes into Clio version. To fix it we should setup checkout action to not do merge commit.
https://github.com/actions/checkout?tab=readme-ov-file#checkout-pull-request-head-commit-instead-of-merge-commit