release notes v5.7.1 (#205)

* release notes v5.7.1

* release notes v5.7.1 escape

Author: duyguokcu

pages/whats-new.mdx

@@ -8,6 +8,15 @@ import Image from 'next/image';
 
 # What's new in MOSTLY AI
 
+## 5.7.1
+
+_November 26th, 2025_
+
+### Resolved issues
+
+- {/* MSD-XXXX */} Downgraded to `ipykernel < 7` to improve stability for Python code execution in the Assistant.
+- {/* MSD-XXXX */} Added automatic retry logic for Python code execution in the Assistant.
+
 ## 5.7.0
 
 _November 21st, 2025_