Add 8.17.9 Connectors release note (#131222)

Author: charlotte-hoblik

docs/reference/connector/docs/connectors-release-notes.asciidoc

@@ -62,6 +62,12 @@ It includes detailed steps, tooling, and resources to help you transition to sup
 IMPORTANT: Users building custom docker images based on this Dockerfile may have to review their configuration for compatibility with the new base image.
 See https://github.com/elastic/connectors/pull/3063[*PR 3063*].
 
+[discrete]
+[[es-connectors-release-notes-8-17-9]]
+=== 8.17.9
+
+No notable changes in this release.
+
 [discrete]
 [[es-connectors-release-notes-8-17-8]]
 === 8.17.8