Update changelogs from fern repo (#2492)

Author: fern-support

fern/products/sdks/overview/ruby/changelog/2025-12-03.mdx

@@ -0,0 +1,8 @@
+## 1.0.0-rc58
+**`(fix):`** Fix additional RuboCop warnings in generated SDK code:
+- Disabled Layout/LineLength cop (long type names and require paths are unavoidable)
+- Set Naming/VariableNumber to snake_case style (allows `last_4`, `address_1`, etc.)
+- Renamed `get_token` and `get_auth_headers` methods to `token` and `auth_headers`
+- Replaced OpenStruct with Struct in iterator tests
+
+