Fix the following errors:
```
osbuild/util/lvm2.py:117: error: Only instance methods can be decorated with @property
osbuild/api.py:50: error: Only instance methods can be decorated with @property
osbuild/sources.py:85: error: Only instance methods can be decorated with @property
```
Chaining of `@classmethod` and `@property` has been deprecated since
Python 3.11 with a note that chaining didn't work correctly in some
cases.
Relevant links:
https://github.com/python/mypy/issues/13746https://docs.python.org/3.11/whatsnew/3.11.html#language-builtins
Signed-off-by: Tomáš Hozza <thozza@redhat.com>
This module provides a `Disk` class that can be used
to read in LVM images and explore and manipulate its
metadata directly, i.e. it reads and writes the data
and headers directly. This allows one to rename an
volume group without having to involve the kernel,
which does not like to have two active LVM volume
groups with the same name.
