update extension cover image in README.md

Author: thrau

README.md

@@ -1,9 +1,10 @@
 # LocalStack Extensions (beta)
 
 <p align="center">
-  <img src="https://user-images.githubusercontent.com/3996682/184503940-c30bfcac-e049-4ee4-b905-207b340111d1.png" alt="LocalStack Extensions">
+  <img src="https://github.com/localstack/localstack-extensions/assets/3996682/bba99a4a-e479-4da9-ba3e-1ea9ce80f9b7" alt="LocalStack Extensions">
 </p>
 
+
 With LocalStack 1.0 we have introduced LocalStack Extensions that allow
 developers to extend and customize LocalStack. Both the feature and the API
 are currently experimental and may be subject to change.