feat(sso): refactor SSO provider update logic

- Changed the update mechanism for SSO providers to use a new `updateSSOProvider` function, improving code clarity and maintainability.
- Updated the payload structure for OIDC and SAML configurations to directly use the input values instead of stringifying them.
- Enhanced the overall handling of SSO provider updates within the API router.

packages/server/src/lib/auth.ts

@@ -349,6 +349,7 @@ export const auth = {
 	handler,
 	createApiKey: api.createApiKey,
 	registerSSOProvider: api.registerSSOProvider,
+	updateSSOProvider: api.updateSSOProvider,
 };
 
 export const validateRequest = async (request: IncomingMessage) => {