Bump 8398a7/action-slack from 3.10.0 to 3.12.0

Bumps [8398a7/action-slack](https://github.com/8398a7/action-slack) from 3.10.0 to 3.12.0.
- [Release notes](https://github.com/8398a7/action-slack/releases)
- [Commits](8398a7/action-slack@c84a35c...c9ff874)

---
updated-dependencies:
- dependency-name: 8398a7/action-slack
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/ci-model-regression-on-schedule.yml

@@ -388,7 +388,7 @@ jobs:
 
       - name: Notify Slack of Failure 😱
         if: failure()  && steps.issue-exists.outputs.result == 'false'
-        uses: 8398a7/action-slack@c84a35cfa82a01f3733a3cbf5d5260123e55c2f9  # v3
+        uses: 8398a7/action-slack@c9ff874f8549f97317ec9f6162d5449ee77bc984  # v3
         with:
           status: custom
           fields: workflow,job,commit,repo,ref,author,took
@@ -545,7 +545,7 @@ jobs:
 
       - name: Notify Slack when Performance Drops 💬
         if: steps.performance.outputs.is_dropped == 'true' && steps.issue-exists.outputs.result == 'false'
-        uses: 8398a7/action-slack@c84a35cfa82a01f3733a3cbf5d5260123e55c2f9 #v3
+        uses: 8398a7/action-slack@c9ff874f8549f97317ec9f6162d5449ee77bc984 #v3
         with:
           status: custom
           fields: workflow,job,commit,repo,ref,author,took