Update build-tools tag

Author: benbp

eng/pipelines/templates/stages/1es-redirect.yml

@@ -7,7 +7,7 @@ resources:
     - repository: azure-sdk-build-tools
       type: git
       name: internal/azure-sdk-build-tools
-      ref: refs/tags/1es-migration
+      ref: refs/tags/azure-sdk-build-tools_20240320.1
 
 parameters:
 - name: stages