Turns out this is important for the black formatting tool to work
correctly. The formatting won't generally change between python versions
(it only depends on `black`'s version), but the formatted code needs to
be parseable by the system python version. One script uses
```python
def foo[T](x: T) -> T:
```
syntax, which is only supported in Python 3.12 and later.
Running `pre-commit` will now require a python 3.12 installation (which
is already what we mandate for internal developer environment setup).
The error in case of absence of such a version is pretty clear though.
fe1e562f8d