Update changelogs from fern repo (#4996)

Co-authored-by: dsinghvi <10870189+dsinghvi@users.noreply.github.com>

Author: fern-support

fern/products/sdks/generators/python/changelog/2026-04-18.mdx

@@ -0,0 +1,7 @@
+## 5.5.2
+**`(fix):`** Fix generated wire tests and dynamic snippets to honor `pydantic_config.union_naming: v1`.
+Previously, variant class names in wire tests and README/reference snippets were always
+emitted with the v0 suffix style (e.g. `UnionName_Variant`), causing import errors when
+the SDK types were generated with v1 prefix-style names (e.g. `VariantUnionName`).
+
+