Update changelogs from fern repo (#4312)

Co-authored-by: jsklan <100491078+jsklan@users.noreply.github.com>

Author: fern-support

fern/products/sdks/overview/go/changelog/2026-03-16.mdx

@@ -1,3 +1,9 @@
+## 1.30.3
+**`(fix):`** Use `any` instead of `interface{}` for unknown type schemas. Since Go 1.18+,
+`any` is the idiomatic alias for `interface{}`. This is a purely cosmetic
+modernization with no behavioral change.
+
+
 ## 1.30.2
 **`(fix):`** Fix Basic Auth header not being sent when the username is an empty string.
 Per RFC 7617, an empty user-id is valid in Basic Auth (e.g., `:password`).