[Keyvault] az keyvault security-domain upload: Fix `password must b…

…e bytes-like` for `--passwords` (#23187)

* `az keyvault security-domain upload`: Fix `password must be bytes-like` for `--passwords`

* linter

src/azure-cli/azure/cli/command_modules/keyvault/custom.py

@@ -2421,6 +2421,8 @@ def _security_domain_gen_share_arrays(sd_wrapping_keys, passwords, shared_keys,
         with open(private_key_path, 'rb') as f:
             pem_data = f.read()
             password = passwords[private_key_index] if private_key_index < len(passwords) else None
+            if password and not isinstance(password, bytes):
+                password = password.encode(encoding="utf-8")
             private_key = load_pem_private_key(pem_data, password=password, backend=default_backend())
 
         with open(cert_path, 'rb') as f: