Rebasehelper

Changed
- Replaced `m2r` with `pandoc` for documentation building

Fixed
- Fixed mocking of macros in the test suite

Fixed
- Fixed broken **commit-hash-updater** SPEC hook

Changed
- Changed handling of `%patch` macros to use the specfile library

Fixed
- Replaced `%patchN` macros (obsoleted in `rpm` 4.20) in test files with supported variants

Changed
- Removed dependency on obsoleted setuptools_scm_git_archive

Fixed
- *debuginfo* packages are now skipped when running **sonamecheck**

Changed
- Replaced our own implementation of lookaside cache client with *rpkg*
- Switched from docker to podman in GitHub Actions
- Added a 30 seconds time limit to bugzilla queries
- Dropped support for Python < 3.9 and EPEL 8
- Switched to [specfile](https://github.com/packit/specfile) library

Removed
- Removed `--keep-comments` option