Update notify-security-pipeline username

.gitlab/ci/notify.gitlab-ci.yml

@@ -33,4 +33,4 @@ notify-security-pipeline:
     - echo "NOTIFY_CHANNEL is ${NOTIFY_CHANNEL}"
     - echo "CI_PIPELINE_URL is ${CI_PIPELINE_URL}"
     # <!subteam^S0127FU8PDE> mentions the `@release-managers` group
-    - scripts/slack ${NOTIFY_CHANNEL} "<!subteam^S0127FU8PDE> ☠️  Pipeline for merged result failed! ☠️ See ${CI_PIPELINE_URL} (triggered from ${MERGE_REQUEST_URL})" ci_failing gitlab-release-tools-bot
+    - scripts/slack ${NOTIFY_CHANNEL} "<!subteam^S0127FU8PDE> ☠️  Pipeline for merged result failed! ☠️ See ${CI_PIPELINE_URL} (triggered from ${MERGE_REQUEST_URL})" ci_failing "GitLab Release Tools Bot"