[release/8.0] Update dependencies from dotnet/source-build-externals (#50829)

[release/8.0] Update dependencies from dotnet/source-build-externals


 - Update EventTest.cs

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -189,9 +189,9 @@
       <Uri>https://github.com/dotnet/runtime</Uri>
       <Sha>9cdbc87dadbf358206f20f17fed005cdcb253452</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-externals" Version="8.0.0-alpha.1.23468.1">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-externals" Version="8.0.0-alpha.1.23469.1">
       <Uri>https://github.com/dotnet/source-build-externals</Uri>
-      <Sha>e9d6489787a5ea5400a31dfa34aa6ad6b590de9b</Sha>
+      <Sha>c42a7ce3b6fa02957e7b4ef995c5c2a9a23d294c</Sha>
       <SourceBuild RepoName="source-build-externals" ManagedOnly="true" />
     </Dependency>
     <Dependency Name="Microsoft.SourceBuild.Intermediate.symreader" Version="2.0.0-beta-23228-03">

eng/Versions.props

@@ -9,7 +9,8 @@
     <AspNetCoreMajorVersion>8</AspNetCoreMajorVersion>
     <AspNetCoreMinorVersion>0</AspNetCoreMinorVersion>
     <AspNetCorePatchVersion>0</AspNetCorePatchVersion>
-    <PreReleaseVersionIteration></PreReleaseVersionIteration>
+    <PreReleaseVersionIteration>
+    </PreReleaseVersionIteration>
     <ValidateBaseline>true</ValidateBaseline>
     <IdentityModelVersion>7.0.0</IdentityModelVersion>
     <!--
@@ -164,7 +165,7 @@
     <MicrosoftDotNetBuildTasksTemplatingVersion>8.0.0-beta.23463.1</MicrosoftDotNetBuildTasksTemplatingVersion>
     <MicrosoftDotNetRemoteExecutorVersion>8.0.0-beta.23463.1</MicrosoftDotNetRemoteExecutorVersion>
     <!-- Packages from dotnet/source-build-externals -->
-    <MicrosoftSourceBuildIntermediatesourcebuildexternalsVersion>8.0.0-alpha.1.23468.1</MicrosoftSourceBuildIntermediatesourcebuildexternalsVersion>
+    <MicrosoftSourceBuildIntermediatesourcebuildexternalsVersion>8.0.0-alpha.1.23469.1</MicrosoftSourceBuildIntermediatesourcebuildexternalsVersion>
     <!-- Packages from dotnet/source-build-reference-packages -->
     <MicrosoftSourceBuildIntermediatesourcebuildreferencepackagesVersion>8.0.0-alpha.1.23463.1</MicrosoftSourceBuildIntermediatesourcebuildreferencepackagesVersion>
     <!-- Packages from dotnet/symreader -->