chore: Update supported-versions (#824)

* Update supported-versions.adoc

* Update supported-versions.adoc

* fix: Bump 3.8.0 to 3.8.1, restore 3.7.1, mark both as deprecated

Author: NickLarsenNZ

docs/modules/kafka/partials/supported-versions.adoc

@@ -2,5 +2,7 @@
 // This is a separate file, since it is used by both the direct Kafka documentation, and the overarching
 // Stackable Platform documentation.
 
-* 3.8.0
-* 3.7.1 (LTS)
+* 3.9.0
+* 3.8.1 (deprecated)
+* 3.7.2 (LTS)
+* 3.7.1 (deprecated)