add release notes for 2.6 query workbench (#48)

* add release notes for 2.6 query workbench

Signed-off-by: Derek Ho <dxho@amazon.com>

* add CI item in infra

Signed-off-by: Derek Ho <dxho@amazon.com>

---------

Signed-off-by: Derek Ho <dxho@amazon.com>
(cherry picked from commit 5cecd8d)

release-notes/opensearch-query-workbench.release-notes-2.6.0.0.md

@@ -0,0 +1,15 @@
+## Version 2.6.0.0
+
+Compatible with OpenSearch and OpenSearch Dashboards Version 2.6.0
+
+### Maintenance
+
+- Rename plugin_helpers to plugin-helpers ([#32](https://github.com/opensearch-project/dashboards-query-workbench/pull/32))
+- Bump version to 2.6.0 ([#37](https://github.com/opensearch-project/dashboards-query-workbench/pull/37))
+
+### Security Fixes
+
+- Upgrade hapi-latest to fix CVE-2023-25166 ([#40](https://github.com/opensearch-project/dashboards-query-workbench/pull/40))
+
+### Infrastructure
+- Fix Node.js and Yarn installation in CI ([#46](https://github.com/opensearch-project/dashboards-query-workbench/pull/46))