Update changelogs from fern repo (#4510)

Co-authored-by: iamnamananand996 <31537362+iamnamananand996@users.noreply.github.com>

Author: fern-support

fern/products/sdks/overview/rust/changelog/2026-03-23.mdx

@@ -1,3 +1,12 @@
+## 0.26.5
+**`(chore):`** Remove `Default` impl from `ApiClientBuilder` to improve forward compatibility.
+The `..Default::default()` spread pattern on builder types can silently swallow
+new required fields added in future versions. Removing `Default` ensures that
+consumers are guided by the compiler to handle any new fields explicitly.
+Updated README WebSocket snippets to use explicit `ClientConfig` construction
+instead of the `..Default::default()` spread.
+
+
 ## 0.26.4
 **`(chore):`** Add `Default` implementation for `ApiClientBuilder` and update README snippet generation
 to use a simpler struct-based client initialization pattern with `ClientConfig { token: ..., ..Default::default() }`.