update branding to preview9

Author: AdamYoblick

eng/Versions.props

@@ -3,7 +3,7 @@
   <PropertyGroup>
     <VersionPrefix>4.8.0</VersionPrefix>
     <!-- version in our package name #.#.#-below.#####.## -->
-    <PreReleaseVersionLabel>rc1</PreReleaseVersionLabel>
+    <PreReleaseVersionLabel>preview9</PreReleaseVersionLabel>
     <!-- Use the compiler in the CLI instead of in the sdk, since the sdk one doesn't work with netcoreapp3.0 yet -->
     <UsingToolMicrosoftNetCompilers>false</UsingToolMicrosoftNetCompilers>
   </PropertyGroup>