update changelog

Author: github-actions[bot]

docs/changelog/changelog.mdx

@@ -4,6 +4,11 @@ icon: "clock"
 iconType: "solid"
 ---
 
+<Update label="v0.52.21" description="March 24, 2025">
+### [Improves stability with sentry-sdk update.](https://github.com/codegen-sh/codegen-sdk/releases/tag/v0.52.21)
+- Update sentry-sdk to improve stability
+</Update>
+
 <Update label="v0.52.20" description="March 24, 2025">
 ### [Removed legacy agent components.](https://github.com/codegen-sh/codegen-sdk/releases/tag/v0.52.20)
 - Remove legacy agent components