Update changelog

Author: trodge

CHANGELOG.md

@@ -1,4 +1,8 @@
-## 7.1.0 (Unreleased)
+## 7.1.1 (September 3, 2025)
+
+* bigtable: fixed an error encountered when applying `google_bigtable_table_iam_*` resources after upgrading to 7.x and replacing `instance` with `instance_name` ([#10667](https://github.com/hashicorp/terraform-provider-google-beta/pull/10667))
+
+## 7.1.0 (September 2, 2025)
 
 DEPRECATIONS:
 * container: deprecated `enterprise_config` field in `google_container_cluster` resource. GKE Enterprise features are now available without an Enterprise tier. ([#10646](https://github.com/hashicorp/terraform-provider-google-beta/pull/10646))