fix: invalid certificate publishing (#1509)

## 📜 Description

Fixed a problem with publishing latest release.

## 💡 Motivation and Context

It happens because of checkout action. Sometime it may read a detached
commit, which is obviously not verified and because of that package will
not be published.

In this PR I'm fixing it.

## 📢 Changelog

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### CI

- bump checkout to v6;
- use  `${{ github.event.release.tag_name }}` as a stable reference;

## 🤔 How Has This Been Tested?

Will test after merge to `main`.

## 📸 Screenshots (if appropriate):

N/A

## 📝 Checklist

- [x] CI successfully passed
- [x] I added new mocks and corresponding unit-tests if library API was
changed