fix(op-acceptance-tests): flake-shake; slack notification channel. (#17931)

Author: scharissis

.circleci/config.yml

@@ -1772,7 +1772,7 @@ jobs:
             jq -c '{blocks: .}' /tmp/blocks.json > /tmp/slack_template.json
             echo 'export SLACK_TEMPLATE=$(cat /tmp/slack_template.json)' >> $BASH_ENV
       - slack/notify:
-          channel: notify-ci-failures
+          channel: C03N11M0BBN  # "notify-ci" channel
           event: always
           retries: 1
           retry_delay: 3