Update changelogs from fern repo (#5179)

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

Author: fern-support

fern/products/sdks/generators/rust/changelog/2026-04-27.mdx

@@ -0,0 +1,5 @@
+## 0.34.0
+**`(feat):`** Use auth scheme placeholder values in snippets when configured via
+`placeholder` field on auth schemes.
+
+