Add 9.1.3 search connectors release notes (#133460)

Author: charlotte-hoblik

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

@@ -13,6 +13,9 @@ If you are an Enterprise Search user and want to upgrade to Elastic 9.0, refer t
 It includes detailed steps, tooling, and resources to help you transition to supported alternatives in 9.x, such as Elasticsearch, the Open Web Crawler, and self-managed connectors.
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+## 9.1.3 [connectors-9.1.3-release-notes]
+There are no new features, enhancements, fixes, known issues, or deprecations associated with this release.
+
 ## 9.1.2 [connectors-9.1.2-release-notes]
 There are no new features, enhancements, fixes, known issues, or deprecations associated with this release.