Freeze during generation of HTML (with typing)

Consider the following source `bar.py`:

```
import typing

class Bar:
def type_info():
return None

ROW_ANNOTATION = typing.Tuple[
str]
```

`conf.py`:

```
extensions = [
'sphinx_automodapi.automodapi',
]
```

`index.rst`:

```
.. automodapi:: bar
```

After command `PYTHONPATH=. sphinx-build -b html . html_python` sphix-automodapi hangs with the following output:

```
PYTHONPATH=. sphinx-build -b html . html_python
Running Sphinx v5.3.0+/a5588443
loading pickled environment... done
[autosummary] generating autosummary for: api/bar.Bar.rst, index.rst
[automodsumm] index.rst: found 1 automodsumm entries to generate
building [mo]: targets for 0 po files that are out of date
building [html]: targets for 2 source files that are out of date
updating environment: [extensions changed ('sphinx_automodapi.automodapi')] 2 added, 0 changed, 0 removed
reading sources... [ 50%] api/bar.Bar
```

Reproduce the hang with bar.py, conf.py, and index.rst using the shown PYTHONPATH=. sphinx-build -b html . html_python command. Start by examining the automodapi-generated api/bar.Bar.rst and the build output around reading sources at 50%. Done means HTML generation completes for the provided typing.Tuple example without freezing.

Written by the indexing model from the issue text.