Update changelogs from fern repo (#5523)

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

Author: fern-support

fern/products/sdks/generators/python/changelog/2026-05-15.mdx

@@ -0,0 +1,7 @@
+## 5.12.9
+**`(fix):`** Bump @fern-api/generator-cli to 0.9.28, which sets explicit author and
+committer on API-created commits to the Fern bot identity. Fixes commit
+attribution on GitHub Enterprise where PAT-based authentication previously
+attributed commits to the PAT-owning service account instead of fern-api[bot].
+
+