Add release notes for 2.19.6 (#973)

Signed-off-by: opensearch-ci-bot <opensearch-infra@amazon.com>

Author: opensearch-ci-bot

release-notes/opensearch-common-utils.release-notes-2.19.6.0.md

@@ -0,0 +1,12 @@
+## Version 2.19.6 Release Notes
+
+Compatible with OpenSearch and OpenSearch Dashboards version 2.19.6
+
+### Bug Fixes
+
+* Validate api_type matches path in ClusterMetricsInput to prevent creating monitors with mismatched fields that cannot be deleted ([#914](https://github.com/opensearch-project/common-utils/pull/914))
+* Normalize cluster metrics input URI path during validation to fix exception when path is not prepended with `/` ([#922](https://github.com/opensearch-project/common-utils/pull/922))
+
+### Infrastructure
+
+* Add CI mirror repository to avoid Maven Central throttling during builds ([#976](https://github.com/opensearch-project/common-utils/pull/976))