Update changelogs from fern repo (#989)

Co-authored-by: tstanmay13 <[email protected]>

Author: fern-support

fern/products/sdks/overview/java/changelog/2025-09-25.mdx

@@ -1,3 +1,8 @@
+## 3.6.2
+**`(fix):`** Fixed SDK variable setters incorrectly referencing non-existent `clientOptionsBuilder`.
+Variables now store in instance fields and apply via `setVariables()` method.
+
+
 ## 3.6.1
 **`(fix):`** Fixed wire tests failing with `InvalidDefinitionException` for `Optional<T>` serialization by using
 the configured `ObjectMappers.JSON_MAPPER` instead of plain `ObjectMapper`.