Update CHANGELOG.md for #44933

Author: changelogbot

CHANGELOG.md

@@ -1,5 +1,9 @@
 ## 6.21.0 (Unreleased)
 
+ENHANCEMENTS:
+
+* resource/aws_sagemaker_endpoint_configuration: Add `execution_role_arn` argument and make `model_name` optional in `production_variants` and `shadow_production_variants` blocks to support Inference Components ([#44977](https://github.com/hashicorp/terraform-provider-aws/issues/44977))
+
 BUG FIXES:
 
 * resource/aws_sagemaker_endpoint: Fix bug where `endpoint_config_name` was not correctly updated, causing the endpoint to retain the old configuration ([#42843](https://github.com/hashicorp/terraform-provider-aws/issues/42843))