[Bug]: PyPI package missing requirements.txt

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### Expected Behavior

Downloading the package from PyPI should include the requirements.txt file as the included setup.py references this file and crashes without it.

### Actual Behavior

When downloading the latest version (0.0.17) of the package from PyPI, there is no requirements.txt file included. I also checked 0.0.16 and found it missing from that package.

### Steps to Reproduce

1. Download 0.0.17 package from PyPI
2. Extract using method of choice
3. Observe that the requirements.txt file is absent

### Error Output

```
Traceback (most recent call last):
File "/home/.../src/ansible_specdoc-0.0.17/setup.py", line 31, in
install_requires=requirements_path.read_text().splitlines(),
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.12/pathlib.py", line 1027, in read_text
with self.open(mode='r', encoding=encoding, errors=errors) as f:
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.12/pathlib.py", line 1013, in open
return io.open(self, mode, buffering, encoding, errors, newline)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: '/home/.../src/ansible_specdoc-0.0.17/requirements.txt'
```

Start by inspecting setup.py and the package contents produced for PyPI, then reproduce the download and extraction steps for version 0.0.17. Confirm that requirements.txt is included in the built package and that setup.py no longer fails when the package is installed.

Written by the indexing model from the issue text.