Update dependencies from https://github.com/dotnet/arcade build 20251015.1 (#1418)

On relative base path root
Microsoft.DotNet.Arcade.Sdk From Version 8.0.0-beta.25504.1 -> To Version 8.0.0-beta.25515.1

Co-authored-by: dotnet-maestro[bot] <dotnet-maestro[bot]@users.noreply.github.com>

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -11,9 +11,9 @@
       <Sha>30ed464acd37779c64e9dc652d4460543ebf9966</Sha>
       <SourceBuild RepoName="source-build-reference-packages" ManagedOnly="true" />
     </Dependency>
-    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="8.0.0-beta.25504.1">
+    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="8.0.0-beta.25515.1">
       <Uri>https://github.com/dotnet/arcade</Uri>
-      <Sha>3edea53c9b10e4bc63de863d71a05d47d9bb5b69</Sha>
+      <Sha>6544413e02741855b701468aa8afc6cf8ca62c72</Sha>
       <SourceBuild RepoName="arcade" ManagedOnly="true" />
     </Dependency>
     <Dependency Name="Microsoft.DotNet.GenAPI.Task" Version="8.0.100-rc.2.23460.8">

global.json

@@ -1,9 +1,9 @@
 {
   "tools": {
-    "dotnet": "8.0.120"
+    "dotnet": "8.0.121"
   },
   "msbuild-sdks": {
-    "Microsoft.DotNet.Arcade.Sdk": "8.0.0-beta.25504.1",
+    "Microsoft.DotNet.Arcade.Sdk": "8.0.0-beta.25515.1",
     "Microsoft.Build.NoTargets": "3.7.0"
   }
 }