Added v1.2.0 release notes (#414)

#### 1.2.0 February 25th 2025 ####

* Added F# template support for the [Akka.Streams template](https://github.com/akkadotnet/akkadotnet-templates/blob/dev/docs/AkkaStreamsTemplate.md) - see the docs for an example

Author: Aaronontheweb

RELEASE_NOTES.md

@@ -1,4 +1,3 @@
-#### 1.1.0 February 19th 2025 ####
+#### 1.2.0 February 25th 2025 ####
 
-* Added F# template support for the [Akka.Console template](https://github.com/akkadotnet/akkadotnet-templates/blob/dev/docs/ConsoleTemplate.md) - see the docs for an example
-* Upgraded to [Akka.NET v1.5.38](https://github.com/akkadotnet/akka.net/releases/tag/1.5.38)
+* Added F# template support for the [Akka.Streams template](https://github.com/akkadotnet/akkadotnet-templates/blob/dev/docs/AkkaStreamsTemplate.md) - see the docs for an example