This code:

```python
from rstr import Rstr
from random import SystemRandom
Rstr(SystemRandom())
```

Fails to pass pyright tests. `_Random.shuffle()` expects two arguments,
one optional, but since Python 3.11 `Random.shuffle()` only takes one
argument.

No need to add version-specific code: the new version works OK with
Python < 3.11.

Ref: python/cpython#25874

This code:

```python
from rstr import Rstr
from random import SystemRandom
Rstr(SystemRandom())
```

Fails to pass pyright tests. `_Random.shuffle()` expects two arguments,
one optional, but since Python 3.11 `Random.shuffle()` only takes one
argument (see python/cpython#25874).

typeshed includes a stub for Random, so it's now possible to use it
directly instead of maintaining a custom stub for it.

This code:

```python
from rstr import Rstr
from random import SystemRandom
Rstr(SystemRandom())
```

Fails to pass pyright tests. `_Random.shuffle()` expects two arguments,
one optional, but since Python 3.11 `Random.shuffle()` only takes one
argument (see python/cpython#25874).

typeshed includes a stub for Random, so it's now possible to use it
directly instead of maintaining a custom stub for it.