Update changelogs from fern repo (#964)

Co-authored-by: patrickthornton <[email protected]>

Author: fern-support

fern/products/sdks/overview/go/changelog/2025-09-24.mdx

@@ -1,3 +1,7 @@
+## 1.12.3
+**`(fix):`** Handle error codes using a shared error decoder.
+
+
 ## 1.12.2
 **`(fix):`** Fix small inconsistencies in dynamic snippets logic blocking wire test generation