Bump package version to 1.9.0

Author: YunchuWang

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Changelog
 
-## v1.9.0 (unreleased)
+## v1.9.0
 
 - Introduce default version setting to DurableTaskClient and expose to orchestrator ([#393](https://github.com/microsoft/durabletask-dotnet/pull/393))
 - Add support for local credential types in DTS libraries ([#396](https://github.com/microsoft/durabletask-dotnet/pull/396))

eng/targets/Release.props

@@ -17,7 +17,7 @@
   </PropertyGroup>
 
   <PropertyGroup>
-    <VersionPrefix>1.8.1</VersionPrefix>
+    <VersionPrefix>1.9.0</VersionPrefix>
     <VersionSuffix></VersionSuffix>
   </PropertyGroup>