Python 3.13 support

## Feature Request

Is there any plan to make this library compatible with python3.13

Today under python3.13, we get the following : 

```
paste/deploy/loadwsgi.py:64: in NicerConfigParser
    read_file = getattr(ConfigParser, 'read_file', ConfigParser.readfp)
E   AttributeError: type object 'ConfigParser' has no attribute 'readfp'. Did you mean: 'read'?
```