update changelog

Author: github-actions[bot]

docs/changelog/changelog.mdx

@@ -4,6 +4,12 @@ icon: "clock"
 iconType: "solid"
 ---
 
+<Update label="v0.48.9" description="March 11, 2025">
+### [File tool improvements and dependency update](https://github.com/codegen-sh/codegen-sdk/releases/tag/v0.48.9)
+- Update dependency openai to v1.66.1
+- Improve create file tool functionality
+</Update>
+
 <Update label="v0.48.8" description="March 11, 2025">
 ### [Enhancements in documentation and repository retrieval.](https://github.com/codegen-sh/codegen-sdk/releases/tag/v0.48.8)
 - Bug fix: updated openai dependency to v1.66.0