fix wrong version update script name

Author: archerzz

eng/pipelines/update-generator-versions.yml

@@ -17,7 +17,7 @@ jobs:
     displayName: Update SDK Generator Versions
     inputs:
       pwsh: true
-      filePath: $(Build.SourcesDirectory)/autorest.csharp/eng/UpdateAzureSdkGeneratorVersions.ps1
+      filePath: $(Build.SourcesDirectory)/autorest.csharp/eng/UpdateGeneratorMetadata.ps1
       arguments: >
         -AutorestCSharpVersion $(AutorestCSharpVersion)
         -CadlEmitterVersion $(CadlEmitterVersion)