Update changelogs from fern repo (#5162)

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

Author: fern-support

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

@@ -1,3 +1,10 @@
+## 5.8.1
+**`(chore):`** Tighten the generated `urllib3` dev-dependency pin to `>=2.6.3,<3.0.0`
+(Python >= 3.9) to address CVE-2026-21441 and several additional
+HIGH-severity urllib3 advisories. Projects still supporting Python 3.8
+fall back to the tightest safe constraint available for the 1.x line.
+
+
 ## 5.8.0
 **`(feat):`** Support omitting username or password from basic auth when configured via
 `usernameOmit` or `passwordOmit` in the IR. Omitted fields are removed from