[OTHER] Use `ubuntu-22.04` in all GitHub workflows
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Description
### I have searched through the issues and didn't find my problem.
- [X] Confirm
### What would you like to share?
AFAIK, `ubuntu-18.04` doesn't work anymore in GitHub Actions workflows (see [blog post](https://github.blog/changelog/2022-08-09-github-actions-the-ubuntu-18-04-actions-runner-image-is-being-deprecated-and-will-be-removed-by-12-1-22/)).
We should be using newer versions now. `ubuntu-22.04` should be fine, IMO.
### Additional information
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