Update RELEASE_NOTES.md for 1.5.51 release (#547)

Author: Aaronontheweb

RELEASE_NOTES.md

@@ -1,3 +1,7 @@
+#### 1.5.51 October 1st 2025 ####
+
+* [Bump AkkaVersion and AkkaHostingVersion to 1.5.51](https://github.com/akkadotnet/akka.net/releases/tag/1.5.51)
+
 #### 1.5.44 June 23rd 2025 ####
 
 * [Bump AkkaVersion and AkkaHostingVersion to 1.5.44](https://github.com/akkadotnet/akka.net/releases/tag/1.5.44)

src/Directory.Generated.props

@@ -1,8 +1,6 @@
 <Project>
   <PropertyGroup>
-    <VersionPrefix>1.5.27</VersionPrefix>
-    <PackageReleaseNotes>* [Bump Akka to 1.5.27.1](https://github.com/akkadotnet/akka.net/releases/tag/1.5.27.1)
-* [Bump Akka.Hosting to v1.5.27](https://github.com/akkadotnet/Akka.Hosting/releases/tag/1.5.27)
-* [Resolved: Auto initialization of tables isn't supported from the read journal side.](https://github.com/akkadotnet/Akka.Persistence.Sql/issues/344)</PackageReleaseNotes>
+    <VersionPrefix>1.5.51</VersionPrefix>
+    <PackageReleaseNotes>* [Bump AkkaVersion and AkkaHostingVersion to 1.5.51](https://github.com/akkadotnet/akka.net/releases/tag/1.5.51)</PackageReleaseNotes>
   </PropertyGroup>
 </Project>