[nats-streaming] Release v0.23.2

Details can be found [here](https://github.com/nats-io/nats-streaming-server/releases/tag/v0.23.2)

Signed-off-by: Ivan Kozlovic <ivan@synadia.com>

Author: kozlovic

nats-streaming/content.md

@@ -1,5 +1,9 @@
 # [NATS Streaming](https://nats.io): A high-performance cloud native messaging streaming system.
 
+# **WARNING:** Deprecation Notice
+
+The NATS Streaming Server is being deprecated. Critical bug fixes and security fixes will be applied until June of 2023. NATS enabled applications requiring persistence should use [JetStream](https://docs.nats.io/jetstream/jetstream).
+
 %%LOGO%%
 
 `nats-streaming` is a high performance streaming server for the NATS Messaging System.