Update changelogs from fern repo (#499)

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

Author: fern-support

fern/products/sdks/overview/ruby/changelog/2025-08-18.mdx

@@ -1,3 +1,6 @@
+## 1.0.0-rc5
+**`(fix):`** Fix module name for internal JSON request.
+
 ## 1.0.0-rc4
 **`(fix):`** Fix syntax for Union types extending the Union module.