Update CoreClr, CoreFx to rtm-26508-04, rtm-26508-03, respectively (#17927)

Author: dotnet-maestro-bot

ILAsmVersion.txt

@@ -1 +1 @@
-2.1.0-rtm-26505-03
+2.1.0-rtm-26508-04

dependencies.props

@@ -23,18 +23,18 @@
 
   <!-- Source of truth for dependency tooling: the commit hash of the dotnet/versions master branch as of the last auto-upgrade. -->
   <PropertyGroup>
-    <CoreFxCurrentRef>923fc4e4aade5e96f0ebdbd76edfa36dd0a2985c</CoreFxCurrentRef>
-    <CoreClrCurrentRef>923fc4e4aade5e96f0ebdbd76edfa36dd0a2985c</CoreClrCurrentRef>
+    <CoreFxCurrentRef>88565452637e4312f259161d5006ef24870858c7</CoreFxCurrentRef>
+    <CoreClrCurrentRef>88565452637e4312f259161d5006ef24870858c7</CoreClrCurrentRef>
     <BuildToolsCurrentRef>2f4e25ff2bccea64c3da62bff526f24ad3c032de</BuildToolsCurrentRef>
     <PgoDataCurrentRef>2696080f7aff31f90447d6030c43fa4792a55fdf</PgoDataCurrentRef>
   </PropertyGroup>
 
   <!-- Tests/infrastructure dependency versions. -->
   <PropertyGroup>
-    <MicrosoftPrivateCoreFxNETCoreAppPackageVersion>4.5.0-rtm-26505-03</MicrosoftPrivateCoreFxNETCoreAppPackageVersion>
-    <MicrosoftNETCorePlatformsPackageVersion>2.1.0-rtm-26505-03</MicrosoftNETCorePlatformsPackageVersion>
+    <MicrosoftPrivateCoreFxNETCoreAppPackageVersion>4.5.0-rtm-26508-03</MicrosoftPrivateCoreFxNETCoreAppPackageVersion>
+    <MicrosoftNETCorePlatformsPackageVersion>2.1.0-rtm-26508-03</MicrosoftNETCorePlatformsPackageVersion>
     <PgoDataPackageVersion>2.1.0-release-20180502-0048</PgoDataPackageVersion>
-    <MicrosoftNETCoreRuntimeCoreCLRPackageVersion>2.1.0-rtm-26505-03</MicrosoftNETCoreRuntimeCoreCLRPackageVersion>
+    <MicrosoftNETCoreRuntimeCoreCLRPackageVersion>2.1.0-rtm-26508-04</MicrosoftNETCoreRuntimeCoreCLRPackageVersion>
     <XunitPackageVersion>2.2.0-beta2-build3300</XunitPackageVersion>
     <XunitConsoleNetcorePackageVersion>1.0.2-prerelease-00177</XunitConsoleNetcorePackageVersion>
     <XunitPerformanceApiPackageVersion>1.0.0-beta-build0015</XunitPerformanceApiPackageVersion>