@typeguard on a test breaks pytest assertion rewriting

### Things to check first

- [X] I have searched the existing issues and didn't find my bug already reported there

- [X] I have checked that my bug is still present in the latest release

### Typeguard version

4.3.0

### Python version

3.12

### What happened?

Install pytest and typeguard.
Run the following script:

```python
# test_example.py

import pytest

def test_example() -> None:
result = 1
assert result == 2

pytest.main()
```

See output including:

```
def test_example() -> None:
result = 1
> assert result == 2
E assert 1 == 2
```

Now run:

```python
# test_example.py

import pytest
from typeguard import typechecked

@typechecked
def test_example() -> None:
result = 1
assert result == 2

pytest.main()
```

See:

```
def test_example() -> None:
result = 1
> assert result == 2
E AssertionError
```

### How can we reproduce the bug?

Run the code examples from the previous section.