Ogr

- Add a function for setting assignees of issues, by [KPostOffice](https://github.com/KPostOffice), [#589](https://github.com/packit-service/ogr/pull/589)
- 'make check' is now aligned with other Packit projects, by [bcrocker15](https://github.com/bcrocker15), [#593](https://github.com/packit-service/ogr/pull/593)
- Implement support for GitHub [check runs](https://docs.github.com/en/rest/reference/checks#check-runs), by [mfocko](https://github.com/mfocko), [#592](https://github.com/packit-service/ogr/pull/592)

- Add support for listing of projects in GitLab and Github (by our external
contributor [abkosar](https://github.com/abkosar))

- Fixed problems with imports from 'gitlab' modules.

- Exceptions for non-supported features were refactored.
- Behaviour of Github.get_file_content() was unified with GitLab and Pagure.

- Fixed authentication of 'gitlab' type.
- Pagure: enable creating PRs from fork via fork_username.
- Allow ignoring custom instances when creating a project.
- Package is now PEP-561 compliant and mypy is able to use the type information when importing it.

Features

- The retry mechanism of a `GithubService` can be customized using
`max_retries`. [537](https://github.com/packit/ogr/pull/537)

Minor

- `get_latest_release()` returns `None`, instead of raising an exception, when
there were no release in the project, yet. [542](https://github.com/packit/ogr/pull/542)