Dev version bump [skip ci]

Author: nblumhardt

Directory.Version.props

@@ -1,6 +1,6 @@
 <Project>
   <PropertyGroup>
     <!-- This must match the major and minor components of the referenced *.Extensions.* packages (and highest supported .NET TFM). -->
-    <VersionPrefix>9.0.0</VersionPrefix>
+    <VersionPrefix>9.0.1</VersionPrefix>
   </PropertyGroup>
 </Project>