Update changelogs from fern repo (#3493)

Author: fern-support

fern/products/sdks/overview/go/changelog/2026-02-05.mdx

@@ -0,0 +1,7 @@
+## 1.23.7
+**`(fix):`** Fix MarshalJSON not being generated for inlined request types that have properties
+but no literals, dates, reference types, or extra properties. This caused the
+explicitFields tracking (used for explicit null serialization via setter methods)
+to be ineffective for simple request types.
+
+