docs: [LangGraph Server Changelog Bot] Changelog updates for new version(s) (#1785)

Automated changelog update created by the LangGraph Server Changelog
Bot.

Feel free to merge anytime.

Author: samecrowder

src/langsmith/agent-server-changelog.mdx

@@ -5,6 +5,10 @@ sidebarTitle: Agent Server changelog
 
 [Agent Server](/langsmith/agent-server) is an API platform for creating and managing agent-based applications. It provides built-in persistence, a task queue, and supports deploying, configuring, and running assistants (agentic workflows) at scale. This changelog documents all notable updates, features, and fixes to Agent Server releases.
 
+<a id="2025-12-08"></a>
+## v0.5.33
+- Set Uvicorn's keep-alive timeout to 75 seconds to prevent occasional 502 errors and improve connection handling.
+
 <a id="2025-12-06"></a>
 ## v0.5.32
 - Introduced OpenTelemetry telemetry agent with support for New Relic integration.