Update dd-stts-action and use 16 retries (#7263)

Author: cbeauchesne

.github/actions/push_to_test_optim/action.yml

@@ -31,9 +31,10 @@ runs:
       id: dd-sts
       if: github.event.pull_request.user.login != 'dependabot[bot]'
       continue-on-error: true
-      uses: DataDog/dd-sts-action@7d2d231c02fd54a3da912e582ff87cb995d1fd30 # v1.0.4
+      uses: DataDog/dd-sts-action@639d841c72f15e4e77747bd726ef8105ce971da2 # v1.0.5
       with:
         policy: system-tests
+        retries: 16
 
     # https://docs.datadoghq.com/tests/setup/junit_xml/?tab=linux
     - name: Push results