Update diagnostics.md

Updated the ms.date

Author: wadepickett

aspnetcore/grpc/diagnostics.md

@@ -4,7 +4,7 @@ author: jamesnk
 description: Learn how to gather diagnostics from your gRPC app on .NET.
 monikerRange: '>= aspnetcore-3.0'
 ms.author: wpickett
-ms.date: 10/01/2021
+ms.date: 06/20/2025
 uid: grpc/diagnostics
 ---
 # Logging and diagnostics in gRPC on .NET