Delete stubs for cryptography (#9459)

Typeshed's stubs for `paramiko` and `pyOpenSSL` now depend on the `cryptography` package, which now provides inline types at runtime

pyrightconfig.json

@@ -5,10 +5,6 @@
         "stdlib",
         "stubs",
     ],
-    "exclude": [
-        // `cryptography` stubs are outdated and to be removed
-        "stubs/cryptography",
-    ],
     "typeCheckingMode": "basic",
     "strictListInference": true,
     "strictDictionaryInference": true,