Update self-reference for RC1 release (#780)

Author: MichaelSimons

eng/Build.props

@@ -24,10 +24,6 @@
       Format:
       <DependencyPackageProjects Include="$(RepoRoot)src\referencePackages\src\**\Microsoft.Extensions.Options.5.0.0.csproj" />
     -->
-    <DependencyPackageProjects Include="$(RepoRoot)src\referencePackages\src\**\System.Text.Json.7.0.3.csproj" />
-
-    <DependencyPackageProjects Include="$(RepoRoot)src\referencePackages\src\**\xunit.abstractions.2.0.3.csproj" />
-
     <DependencyPackageProjects Include="$(RepoRoot)src\textOnlyPackages\src\microsoft.private.intellisense\8.0.0-preview-20230828.1\Microsoft.Private.Intellisense.8.0.0-preview-20230828.1.csproj" />
 
     <DependencyPackageProjects Include="$(RepoRoot)src\targetPacks\ILsrc\**\Microsoft.NETCore.App.Ref.6.0.2.csproj" />

eng/Version.Details.xml

@@ -6,9 +6,9 @@
       <Sha>33edde07d61cf7606d76ada765335fb81f1cbb71</Sha>
       <SourceBuild RepoName="source-build-externals" ManagedOnly="true" />
     </Dependency>
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-reference-packages" Version="8.0.0-alpha.1.23368.2">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-reference-packages" Version="8.0.0-alpha.1.23414.1">
       <Uri>https://github.com/dotnet/source-build-reference-packages</Uri>
-      <Sha>529fbc2aad419d0c1551d6685cc68be33e62a996</Sha>
+      <Sha>45f5554ac6813e1e155c47fd80ec146c684f65e8</Sha>
       <SourceBuild RepoName="source-build-reference-packages" ManagedOnly="true" />
     </Dependency>
     <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="8.0.0-beta.23451.1">