Switched all services to `eclipse-temurin:21-jre`

[demos/kafka/wordcount] / counter

diff --git a/counter b/counter
index 30e5e8b..996232b 160000 (submodule)
--- a/counter
+++ b/counter
@@ -1 +1 @@
-Subproject commit 30e5e8b9c41f3db0ede62fd0a903a5e54f151ce6
+Subproject commit 996232bdbc8deeca105854f3f04d66715ecfa269