Update maintenance mode message to share upcoming end-of-life (#4603)

Author: trivikr

.changes/next-release/feature-Support-201c0f79.json

@@ -0,0 +1,5 @@
+{
+  "type": "feature",
+  "category": "Support",
+  "description": "Update maintenance mode message to share upcoming end-of-support"
+}

lib/maintenance_mode_message.js

@@ -1,7 +1,8 @@
 var warning = [
-  'We are formalizing our plans to enter AWS SDK for JavaScript (v2) into maintenance mode in 2023.\n',
+  'The AWS SDK for JavaScript (v2) will enter maintenance mode',
+  'on September 8, 2024 and reach end-of-support on September 8, 2025.\n',
   'Please migrate your code to use AWS SDK for JavaScript (v3).',
-  'For more information, check the migration guide at https://a.co/7PzMCcy'
+  'For more information, check blog post at https://a.co/cUPnyil'
 ].join('\n');
 
 module.exports = {