Merged PR 50148: Updating NuGet.config to fix an incorrect merge conflict resolution.

Updating NuGet.config to fix an incorrect merge conflict resolution.

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#### AI description  (iteration 1)
#### PR Classification
Bug fix addressing an incorrect merge conflict resolution in a configuration file.

#### PR Summary
This pull request corrects the package source keys in `NuGet.config` by replacing an outdated key with the correct one, ensuring proper package source resolution.
- `NuGet.config`: Updated the package source key from "darc-int-dotnet-runtime-efd5742" to "darc-int-dotnet-runtime-77545d6" in both the package sources and disabledPackageSources sections.
<!-- GitOpsUserAgent=GitOps.Apps.Server.pullrequestcopilot -->

Author: Shyam-Gupta

NuGet.config

@@ -4,7 +4,7 @@
     <clear />
     <!--Begin: Package sources managed by Dependency Flow automation. Do not edit the sources below.-->
     <!--  Begin: Package sources from dotnet-runtime -->
-    <add key="darc-int-dotnet-runtime-efd5742" value="https://pkgs.dev.azure.com/dnceng/internal/_packaging/darc-int-dotnet-runtime-efd5742b/nuget/v3/index.json" />
+    <add key="darc-int-dotnet-runtime-77545d6" value="https://pkgs.dev.azure.com/dnceng/internal/_packaging/darc-int-dotnet-runtime-77545d6f/nuget/v3/index.json" />
     <add key="darc-int-dotnet-runtime-efd5742-7" value="https://pkgs.dev.azure.com/dnceng/internal/_packaging/darc-int-dotnet-runtime-efd5742b-7/nuget/v3/index.json" />
     <add key="darc-int-dotnet-runtime-efd5742-6" value="https://pkgs.dev.azure.com/dnceng/internal/_packaging/darc-int-dotnet-runtime-efd5742b-6/nuget/v3/index.json" />
     <add key="darc-int-dotnet-runtime-efd5742-5" value="https://pkgs.dev.azure.com/dnceng/internal/_packaging/darc-int-dotnet-runtime-efd5742b-5/nuget/v3/index.json" />
@@ -31,7 +31,7 @@
     <add key="darc-int-dotnet-runtime-efd5742-5" value="true" />
     <add key="darc-int-dotnet-runtime-efd5742-6" value="true" />
     <add key="darc-int-dotnet-runtime-efd5742-7" value="true" />
-    <add key="darc-int-dotnet-runtime-efd5742" value="true" />
+    <add key="darc-int-dotnet-runtime-77545d6" value="true" />
     <!--  End: Package sources from dotnet-runtime -->
     <!--End: Package sources managed by Dependency Flow automation. Do not edit the sources above.-->
   </disabledPackageSources>