Add search connectors release notes 8.19.3 (#133637)

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

@@ -9,6 +9,12 @@
 Prior to version *8.16.0*, the connector release notes were published as part of the {enterprise-search-ref}/changelog.html[Enterprise Search documentation].
 ====
 
+[discrete]
+[[es-connectors-release-notes-8-19-3]]
+=== 8.19.3
+
+There are no new features, enhancements, fixes, known issues, or deprecations associated with this release.
+
 [discrete]
 [[es-connectors-release-notes-8-19-2]]
 === 8.19.2