chore: Update config/versions.yml stack 9.0.4

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Author: elastic-observability-automation[bot]

config/versions.yml

@@ -1,7 +1,7 @@
 versioning_systems:
   stack: &stack
     base: 9.0
-    current: 9.1.0
+    current: 9.0.4
 
   # Using an unlikely high version
   # So that our logic that would display "planned" doesn't trigger