Update changelogs from fern repo (#1582)

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

Author: fern-support

fern/products/sdks/overview/go/changelog/2025-10-21.mdx

@@ -1,3 +1,7 @@
+## 1.13.16
+**`(chore):`** Refactor wire test generation to use the new mock utils.
+
+
 ## 1.13.15
 **`(fix):`** Fix for regression to streaming endpoints call