Release databricks-sdk-py (#1539)

Automated release of `databricks-sdk-py`: regenerated SDK plus the
changelog, version bump, and release-ledger update. See CHANGELOG.md for
the released version(s).

Co-authored-by: databricks-ci-ghec-2[bot] <184307802+databricks-ci-ghec-2[bot]@users.noreply.github.com>

Author: databricks-ci-ghec-2[bot]

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Version changelog
 
-## Release v0.129.0 (2026-08-14)
+## Release v0.129.0 (2026-08-15)
 
 ### API Changes
 * Add `agent_type` field for `databricks.sdk.service.dashboards.GenieConversationSummary`.