JWKRSA -> JWKRSA.load is not RSA

Hi colleagues,

with the code below, while I'm expecting `josepy.jwk.JWKRSA` and key kty `RSA`, I'm getting

```
Generating new key ...
Key generated account_key=JWKRSA(key=)>)

Loaded as:
Key kty: oct
```

the code (Python 3.13.7, josepy==2.2.0)

```
import json
import josepy as jose
from cryptography.hazmat.primitives.asymmetric import rsa

print("Generating new key ...")
private_key = rsa.generate_private_key(
public_exponent=65537,
key_size=2048
)
account_key = jose.JWKRSA(key=private_key)
print(f"Key generated {account_key=}\n")

key_components = account_key.to_json()

restored_account_key = jose.JWKRSA.load(json.dumps(key_components).encode())
print(f"Loaded as: {type(restored_account_key)}")
print(f"Key kty: {restored_account_key.to_json().get('kty', 'unknown')}")
```

Is this bug or I'm missing / misinterpreting something?

Thank you