Update changelogs from fern repo (#5249)

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

Author: fern-support

fern/products/cli-api-reference/cli-changelog/2026-04-29.mdx

@@ -1,3 +1,10 @@
+## 4.108.0
+**`(internal):`** Validate staged changelog entries in `changes/<version>/*.yml` (not just `versions.yml`)
+and trigger the workflow on PRs that touch those staged files. Catches unescaped
+`{}` / `<>` / `#{}` patterns at PR time instead of after autorelease promotes the
+entry to `versions.yml` on `main`.
+
+
 ## 4.107.3
 **`(fix):`** Fix `fern generate --docs --preview` hang when OpenAPI specs contain circular
 `$ref` chains. The unbundled fallback document now has its circular references