Update Versions.props to build 7.0.0-preview.4 packages

eng/Versions.props

@@ -6,7 +6,7 @@
     <PatchVersion>0</PatchVersion>
     <VersionPrefix>$(MajorVersion).$(MinorVersion).$(PatchVersion)</VersionPrefix>
     <PreReleaseVersionLabel>preview</PreReleaseVersionLabel>
-    <PreReleaseVersionIteration>3</PreReleaseVersionIteration>
+    <PreReleaseVersionIteration>4</PreReleaseVersionIteration>
     <PreReleaseBrandingLabel>Preview $(PreReleaseVersionIteration)</PreReleaseBrandingLabel>
     <StabilizePackageVersion Condition=" '$(StabilizePackageVersion)' == '' ">false</StabilizePackageVersion>
     <DotNetFinalVersionKind Condition=" '$(StabilizePackageVersion)' == 'true' ">release</DotNetFinalVersionKind>