trying only one dll for limitation

Author: v-rachitsh

.azdo/pipelines/steps/package-signing.yml

@@ -33,7 +33,7 @@ steps:
     AuthCertName: 'test-toolkit-cert-2025'
     AuthSignCertName: 'test-toolkit-cert-2025'
     FolderPath: '${{ parameters.PackagesPath }}'
-    Pattern: 'Microsoft.AzureHealth.DataServices.*.dll'
+    Pattern: 'Microsoft.AzureHealth.DataServices.Channels.Extensions.dll'
     SessionTimeout: 90
     ServiceEndpointUrl: 'https://api.esrp.microsoft.com/api/v2'
     MaxConcurrency: 25