`pytest.approx()` incorrectly flags nested sequences as unequal

Consider this:
```python
>>> a = [(1.20000000000001,)]
>>> b = [(1.2,)]
>>> a == pytest.approx(b)
False
```

On the other hand:
```python
>>> a[0] == pytest.approx(b[0])
True
```

So I am assuming it is thrown off by the nested sequences.

I am using pytest  8.0.0.
