Build system: reduce number of e2e test retries (prebid#13993)

Author: dgirardi

.github/workflows/test.yml

@@ -135,8 +135,8 @@ jobs:
       - name: Run tests
         uses: nick-fields/retry@v3
         with:
-          timeout_minutes: 10
-          max_attempts: 3
+          timeout_minutes: 20
+          max_attempts: 1
           command: npx gulp e2e-test
 
   coveralls: