Fix "Default will never be executed" warnings

when building without library evolution enabled.

Similar to 9850f4c.

Sources/CryptoSwift/RSA/RSA+Cipher.swift

@@ -96,9 +96,6 @@ extension RSA {
  // We need at least 11 bytes of random padding in order to safely encrypt messages (RFC2313 Section 8.1 - Note 6)
  guard blockSize >= bytes.count + 11 else { throw RSA.Error.invalidMessageLengthForEncryption }
  return Padding.eme_pkcs1v15.add(to: bytes, blockSize: blockSize)
- @unknown default:
- assertionFailure()
- return [UInt8](repeating: UInt8.random(in: 0..<UInt8.max), count: bytes.count)
  }
  }
 
@@ -110,9 +107,6 @@ extension RSA {
  case .raw, .pksc1v15:
  // Format the encrypted bytes before returning
  return Array<UInt8>(repeating: 0x00, count: blockSize - bytes.count) + bytes
- @unknown default:
- assertionFailure()
- return [UInt8](repeating: UInt8.random(in: 0..<UInt8.max), count: bytes.count)
  }
  }
 
@@ -127,9 +121,6 @@ extension RSA {
  // Convert the Octet String into an Integer Primitive using the BigInteger `serialize` method
  // (this effectively just prefixes the data with a 0x00 byte indicating that its a positive integer)
  return Padding.eme_pkcs1v15.remove(from: [0x00] + bytes, blockSize: blockSize)
- @unknown default:
- assertionFailure()
- return [UInt8](repeating: UInt8.random(in: 0..<UInt8.max), count: bytes.count)
  }
  }
  }