Use explicit versions

Author: akoeplinger

eng/Versions.props

@@ -238,9 +238,9 @@
     <MicrosoftAzureSignalRVersion>1.2.0</MicrosoftAzureSignalRVersion>
     <MicrosoftBuildLocatorVersion>1.2.6</MicrosoftBuildLocatorVersion>
     <MicrosoftBuildVersion>17.8.3</MicrosoftBuildVersion>
-    <MicrosoftBuildFrameworkVersion>$(MicrosoftBuildVersion)</MicrosoftBuildFrameworkVersion>
-    <MicrosoftBuildTasksCoreVersion>$(MicrosoftBuildVersion)</MicrosoftBuildTasksCoreVersion>
-    <MicrosoftBuildUtilitiesCoreVersion>$(MicrosoftBuildVersion)</MicrosoftBuildUtilitiesCoreVersion>
+    <MicrosoftBuildFrameworkVersion>17.8.3</MicrosoftBuildFrameworkVersion>
+    <MicrosoftBuildTasksCoreVersion>17.8.3</MicrosoftBuildTasksCoreVersion>
+    <MicrosoftBuildUtilitiesCoreVersion>17.8.3</MicrosoftBuildUtilitiesCoreVersion>
     <!--
       Temporarily override the Microsoft.NET.Test.Sdk version Arcade defaults to. That's incompatible w/ test
       framework in current .NET SDKs.