update changelog

Author: github-actions[bot]

docs/changelog/changelog.mdx

@@ -4,6 +4,13 @@ icon: "clock"
 iconType: "solid"
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+<Update label="v0.48.3" description="March 07, 2025">
+### [Fixes git token issue and integrates xAI provider.](https://github.com/codegen-sh/codegen-sdk/releases/tag/v0.48.3)
+- Fix issue with remote git repo token requirement
+- Integrate new xAI provider
+- Update and expand API documentation
+</Update>
+
 <Update label="v0.48.2" description="March 06, 2025">
 ### [Fixes PR viewing issue returning 404 error.](https://github.com/codegen-sh/codegen-sdk/releases/tag/v0.48.2)
 - Fix issue with viewing PR returning 404