Update RELEASE_NOTES.md for 1.5.37 (#568)

* Bump AkkaVersion to 1.5.37

* Update RELEASE_NOTES.md for 1.5.37

Author: Arkatufus

RELEASE_NOTES.md

@@ -1,3 +1,5 @@
-#### 1.5.36 January 22nd 2025 ####
+#### 1.5.37 January 23rd 2025 ####
 
-* [Bump Akka.NET to 1.5.36](https://github.com/akkadotnet/akka.net/releases/tag/1.5.36)
+Moving all of our BCL dependencies to 8.0 created issues for our .NET 6-9 users when adopting Akka.NET packages that only targeted .NET Standard, so for the time being we're normalizing everything back to 6.0
+
+* [Bump Akka.NET to 1.5.37](https://github.com/akkadotnet/akka.net/releases/tag/1.5.37)