Bump Microsoft.DotNet.Arcade.Sdk from 8.0.0-beta.25263.4 to 8.0.0-beta.26117.2 (#73)

Updated [Microsoft.DotNet.Arcade.Sdk](https://github.com/dotnet/arcade)
from 8.0.0-beta.25263.4 to 8.0.0-beta.26117.2.

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global.json

@@ -9,6 +9,6 @@
     "rollForward": "latestMinor"
   },
   "msbuild-sdks": {
-    "Microsoft.DotNet.Arcade.Sdk": "8.0.0-beta.25263.4"
+    "Microsoft.DotNet.Arcade.Sdk": "8.0.0-beta.26117.2"
   }
-}
+}