chore: remove CONFIG_SESSION_PHONE_VERSION and update related code

- Removed the CONFIG_SESSION_PHONE_VERSION environment variable from the configuration and Docker files.
- Updated the BaileysStartupService to directly fetch the latest WhatsApp Web version without relying on the removed environment variable.
- Adjusted the index router to reflect the changes in the WhatsApp Web version retrieval.

src/api/routes/index.router.ts

@@ -69,8 +69,7 @@ router
       clientName: process.env.DATABASE_CONNECTION_CLIENT_NAME,
       manager: !serverConfig.DISABLE_MANAGER ? `${req.protocol}://${req.get('host')}/manager` : undefined,
       documentation: `https://doc.evolution-api.com`,
-      whatsappWebVersion:
-        process.env.CONFIG_SESSION_PHONE_VERSION || (await fetchLatestWaWebVersion({})).version.join('.'),
+      whatsappWebVersion: (await fetchLatestWaWebVersion({})).version.join('.'),
     });
   })
   .post('/verify-creds', authGuard['apikey'], async (req, res) => {