update CHANGELOG.md

CHANGELOG.md

@@ -29,6 +29,7 @@ ENHANCEMENTS:
 BUG FIXES:
 
 * backend/oss: Flatten `assume_role` block attributes, so that they may be more easily represented in a compatible way with `terraform_remote_state` [GH-29307]
+* config: Fixed a bug in which `ignore_changes = all` would not work in override files [GH-29849]
 * core: Fixed an issue where provider configuration input variables were not properly merging with values in configuration ([#29000](https:/hashicorp/terraform/issues/29000))
 * core: Reduce scope of dependencies that may defer reading of data sources when using `depends_on` or directly referencing managed resources ([#29682](https:/hashicorp/terraform/issues/29682))
 * cli: Blocks using SchemaConfigModeAttr in the provider SDK can now represented in the plan json output ([#29522](https:/hashicorp/terraform/issues/29522))