Python-rpm-spec

- Add support for Python 3.13.
- Drop support for Python 3.8 version.

- Add a
[GitHub workflow](https://github.com/bkircher/python-rpm-spec/actions/workflows/fedora-sources.yml)
that parses all of Fedora's spec files. The workflow runs on each PR.
- The `replace_macro` function gained a new `max_attempts` parameter that
prevents endless recursion in certain scenarios. Thanks
[kraptor](https://github.com/kraptor).
- Add support for Python 3.12.
- Drop support for Python 3.7. It is EOL and no longer supported by the Python
core team.

- Fix replace_macro's behavior with user-defined conditional macros (PR
[56](https://github.com/bkircher/python-rpm-spec/pull/59)). Thanks
[imphil](https://github.com/imphil).
- The parsing of package names was wrong when tab characters where used in
%package ([57](https://github.com/bkircher/python-rpm-spec/issues/57)). This
has been fixed by [tagoh](https://github.com/tagoh).
- Implement parsing of spec files where sub-packages (`%package`) have their own
sources and patches defined. Previously, the parser would just fail with an
error message like
`AttributeError: 'Package' object has no attribute 'sources'`. This is now
fixed.
- Use SemVer for versioning. git tags are now prefixed with `v`, e.g. `v0.15.0`
instead of `0.15.0`.

- Teach replace_macro how to deal with macros that are not wrapped in curly
braces (PR [54](https://github.com/bkircher/python-rpm-spec/pull/54)).
- Add type annotations for tools like mypy, your IDE, and your brain (PR
[55](https://github.com/bkircher/python-rpm-spec/pull/55)).

- Fix parsing of BuildRequires:, Requires:, Conflicts:, Obsoletes:, Provides:
with comments at end of line. Thanks [SuoXC](https://github.com/SuoXC).
- Add CI for Python 3.11.

- Fix %description and %changelog with multi-line strings
[46](https://github.com/bkircher/python-rpm-spec/issues/46). Thanks
[tagoh](https://github.com/tagoh).