update release information (#8044)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

eng/Versions.props

@@ -5,7 +5,7 @@
     <RepositoryUrl>https://github.com/dotnet/dotnet-monitor</RepositoryUrl>
     <VersionPrefix>9.1.0</VersionPrefix>
     <PreReleaseVersionLabel>preview</PreReleaseVersionLabel>
-    <PreReleaseVersionIteration>2</PreReleaseVersionIteration>
+    <PreReleaseVersionIteration>3</PreReleaseVersionIteration>
     <!-- Disable final version kind until merged into release branch. -->
     <DotNetUseShippingVersions>true</DotNetUseShippingVersions>
     <!--