Add 9.0.4 Connectors release note (#131230)

Author: charlotte-hoblik

docs/reference/search-connectors/release-notes.md

@@ -29,6 +29,9 @@ Permissions granted to the `Everyone Except External Users` group were previousl
 ## 9.1.0 [connectors-9.1.0-release-notes]
 There are no new features, enhancements, fixes, known issues, or deprecations associated with this release.
 
+## 9.0.4 [connectors-9.0.4-release-notes]
+No changes since 9.0.3
+
 ## 9.0.3 [connectors-9.0.3-release-notes]
 
 ### Features and enhancements [connectors-9.0.3-features-enhancements]