fix: point 1P resource ref to dependency-updates branch for E2E CI

The e2e-tests.yml template is pulled from the 1P repo. Hardcoding
ref: dev means CI on this branch never picks up template changes on
dependency-updates. Change to dependency-updates so CI uses the
corrected prewarm script path.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: hectormmg

.pipelines/1p-e2e.yml

@@ -34,7 +34,7 @@ resources:
         - repository: 1P
           type: git
           name: IDDP/msal-javascript-1p
-          ref: dev
+          ref: dependency-updates
 
 extends:
     template: v2/OneBranch.NonOfficial.CrossPlat.yml@templates # https://aka.ms/obpipelines/templates