docs: add changelog entry for DSQL OCC retry migration

Author: amaksimo

CHANGELOG.md

@@ -13,6 +13,7 @@ Try to keep listed changes to a concise bulleted list of simple explanations of
 ### Changed
 - The ListObjects "pipeline" algorithm ditches its custom Pipe implementation and replaces it with Go native channels. [#2977](https://github.com/openfga/openfga/pull/2977)
 - Refactor tuple validation and manipulation functions for optimal performance. [#2984](https://github.com/openfga/openfga/pull/2984)
+- Replace custom DSQL OCC retry logic with the `occretry` package from `aurora-dsql-connectors/go/pgx` v0.3.0. [#3](https://github.com/amazon-contributing/upstream-to-openfga/pull/3)
 
 ### Fixed
 - Fixed `OTEL_EXPORTER_OTLP_ENDPOINT` not accepting URIs with schemes (e.g. `http://host:4317`). The scheme is now stripped before passing to the gRPC exporter, and an `https://` scheme enables TLS regardless of the `trace.otlp.tls.enabled` flag. [#2981](https://github.com/openfga/openfga/pull/2981)