Update dependencies from https://github.com/dotnet/emsdk build 20250818.3

Microsoft.SourceBuild.Intermediate.emsdk , Microsoft.NET.Workload.Emscripten.Current.Manifest-8.0.100
 From Version 8.0.19-servicing.25353.2 -> To Version 8.0.20-servicing.25418.3

Author: dotnet-maestro[bot]

NuGet.config

@@ -9,7 +9,7 @@
     <clear />
     <!--Begin: Package sources managed by Dependency Flow automation. Do not edit the sources below.-->
     <!--  Begin: Package sources from dotnet-emsdk -->
-    <add key="darc-pub-dotnet-emsdk-d813f0f" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-dotnet-emsdk-d813f0f9/nuget/v3/index.json" />
+    <add key="darc-pub-dotnet-emsdk-222749b" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-dotnet-emsdk-222749b4/nuget/v3/index.json" />
     <!--  End: Package sources from dotnet-emsdk -->
     <!--  Begin: Package sources from dotnet-sdk -->
     <!--  End: Package sources from dotnet-sdk -->

eng/Version.Details.xml

@@ -92,11 +92,11 @@
     </Dependency>
     <Dependency Name="Microsoft.NET.Workload.Emscripten.Current.Manifest-8.0.100" Version="8.0.20">
       <Uri>https://github.com/dotnet/emsdk</Uri>
-      <Sha>d813f0f9cb673d3b2ef41667fa9de963579c4915</Sha>
+      <Sha>222749b48ecb0fe78f236ca9c61f6ff3b09cdc99</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.emsdk" Version="8.0.20-servicing.25411.4">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.emsdk" Version="8.0.20-servicing.25418.3">
       <Uri>https://github.com/dotnet/emsdk</Uri>
-      <Sha>d813f0f9cb673d3b2ef41667fa9de963579c4915</Sha>
+      <Sha>222749b48ecb0fe78f236ca9c61f6ff3b09cdc99</Sha>
       <SourceBuild RepoName="emsdk" ManagedOnly="true" />
     </Dependency>
     <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-reference-packages" Version="8.0.0-alpha.1.25269.2">