Update changelogs from fern repo (#420)

Co-authored-by: jsklan <[email protected]>

Author: fern-support

fern/products/cli-api-reference/cli-changelog/2025-08-11.mdx

@@ -1,3 +1,6 @@
+## 0.66.1
+**`(fix):`** Add 'vendor' to set of reservved keywords for go.
+
 ## 0.66.01
 **`(chore):`** Improved plumbing of the --runner arg for local SDK generation.