[release/9.0.1xx] Fix SDK Diff pipeline trigger (#49059)

Author: ellahathaway

src/SourceBuild/content/eng/pipelines/source-build-sdk-diff-tests.yml

@@ -9,8 +9,8 @@ schedules:
 # https://learn.microsoft.com/en-us/azure/devops/pipelines/process/pipeline-triggers?view=azure-devops#branch-considerations
 resources:
   pipelines:
-  - pipeline: dotnet-source-build
-    source: dotnet-source-build
+  - pipeline: dotnet-source-build-pre10.0
+    source: dotnet-source-build-pre10.0
     # For releases branches only run on internal/release branches because that's where dependencies flow.
 
     # Previews don't have internal/release branches so they must be run from non-internal release branches.