Bump mvn cli detector timeout to 9 min

Author: zhenghao104

src/Microsoft.ComponentDetection.Detectors/maven/MvnCliComponentDetector.cs

@@ -104,9 +104,11 @@ public class MvnCliComponentDetector : FileComponentDetector
     /// <summary>
     /// Maximum time allowed for the OnPrepareDetectionAsync phase.
     /// This is a safety guardrail to prevent hangs.
-    /// Most repos should complete the full Maven CLI scan within this window.
+    /// The ADO task passes --Timeout 600 (10 min) to the .NET tool, which sits under a
+    /// 12-minute decorator timeout. Setting this to 9 minutes keeps us safely below the
+    /// .NET process timeout while giving Maven CLI maximum room to complete.
     /// </summary>
-    private static readonly TimeSpan PrepareDetectionTimeout = TimeSpan.FromMinutes(5);
+    private static readonly TimeSpan PrepareDetectionTimeout = TimeSpan.FromMinutes(9);
 
     private readonly IMavenCommandService mavenCommandService;
     private readonly IEnvironmentVariableService envVarService;