[release/8.0.1xx] Fix SDK Diff pipeline trigger (#20448)

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
     trigger:
       branches:
         include: