Update RELEASE_NOTES.md for 1.5.43 release (#7687)

Author: Arkatufus

RELEASE_NOTES.md

@@ -1,6 +1,35 @@
-#### 1.5.43 May 23rd, 2025 ####
+#### 1.5.43 June 10th, 2025 ####
 
-*Placeholder for nightlies*
+Akka.NET v1.5.43 contains several bug fixes and also adds new quality of life features.
+
+* [Cluster.Tools: Fix PublishWithAck response message type](https://github.com/akkadotnet/akka.net/pull/7673)
+* [Sharding: Allows sharding delivery consumer to passivate self](https://github.com/akkadotnet/akka.net/pull/7670)
+* [TestKit: Fix CallingThreadDispatcher async context switching](https://github.com/akkadotnet/akka.net/pull/7674)
+* [Persistence.Query: Add non-generic `ReadJournalFor` API method](https://github.com/akkadotnet/akka.net/pull/7679)
+* [Core: Simplify null checks](https://github.com/akkadotnet/akka.net/pull/7659)
+* [Core: Propagate CoordinatedShutdown reason to application exit code](https://github.com/akkadotnet/akka.net/pull/7684)
+* [Core: Bump AkkaAnalyzerVersion to 0.3.3](https://github.com/akkadotnet/akka.net/pull/7685)
+* [Core: Improve IScheduledTellMsg DeadLetter log message](https://github.com/akkadotnet/akka.net/pull/7686)
+
+**New Akka.Analyzer Rules**
+
+We've added three new Akka.Analyzer rules, AK2003, AK2004, and AK2005. All of them addresses the same Akka anti-pattern where a `void async` delegate is being passed into the `ReceiveActor.Receive<T>()` (AK2003), `IDslActor.Receive<T>()` (AK2004), and `ReceivePersistentActor.Command<T>()` (AK2005) message handlers.
+
+Here are the documentation for each new rules:
+* [AK2003 documentation](https://getakka.net/articles/debugging/rules/AK2003.html)
+* [AK2004 documentation](https://getakka.net/articles/debugging/rules/AK2004.html)
+* [AK2005 documentation](https://getakka.net/articles/debugging/rules/AK2005.html)
+
+4 contributors since release 1.5.42
+
+| COMMITS | LOC+ | LOC- | AUTHOR              |
+|---------|------|------|---------------------|
+| 7       | 435  | 19   | Gregorius Soedharmo |
+| 2       | 26   | 23   | Mark Dinh           |
+| 1       | 49   | 136  | Simon Cropp         |
+| 1       | 4    | 0    | Aaron Stannard      |
+
+To [see the full set of changes in Akka.NET v1.5.43, click here](https://github.com/akkadotnet/akka.net/milestone/126?closed=1).
 
 #### 1.5.42 May 21st, 2025 ####