Revert "Update .NET SDK to get composite image fix"

This reverts commit b1b144d.

Author: jkoritzinsky

eng/SourceBuildPrebuiltBaseline.xml

@@ -50,7 +50,7 @@
 
   <!-- Transitive dependencies, suppressed as per https://github.com/dotnet/aspnetcore/pull/57887#issuecomment-2362241518-->
   <Usages>
-    <Usage Id="Microsoft.NETCore.App.Ref" Version="9.0.0-rc.2.24473.5"/>
+    <Usage Id="Microsoft.NETCore.App.Ref" Version="9.0.0-preview.7.24405.7"/>
     <Usage Id="Newtonsoft.Json" Version="13.0.1" />
     <Usage Id="System.Security.Cryptography.Xml" Version="6.0.0" />
   </Usages>

global.json

@@ -1,9 +1,9 @@
 {
   "sdk": {
-    "version": "10.0.100-alpha.1.24551.9"
+    "version": "10.0.100-alpha.1.24510.13"
   },
   "tools": {
-    "dotnet": "10.0.100-alpha.1.24551.9",
+    "dotnet": "10.0.100-alpha.1.24510.13",
     "runtimes": {
       "dotnet/x86": [
         "$(MicrosoftNETCoreBrowserDebugHostTransportVersion)"