According to https://docs.python.org/3.13/whatsnew/3.13.html:

Add PyThreadState_GetUnchecked() function: similar to
PyThreadState_Get(), but don't kill the process with a fatal error if
it is NULL. The caller is responsible to check if the result is
NULL. Previously, the function was private and known as
_PyThreadState_UncheckedGet().

* [minor] Add a missing space

Add a missing space to error message

* Add space after period, always add newline.

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

```
mypy.....................................................................Failed
- hook id: mypy
- exit code: 1

ubench/holder_comparison.py:12: error: Unused "type: ignore" comment, use narrower [import-not-found] instead of [import] code  [unused-ignore]
```