build(deps): bump 8398a7/action-slack from 3.18.0 to 3.19.0 (nginx#1111)

Bumps [8398a7/action-slack](https://github.com/8398a7/action-slack) from 3.18.0 to 3.19.0.
- [Release notes](https://github.com/8398a7/action-slack/releases)
- [Commits](8398a7/action-slack@1750b50...77eaa4f)

---
updated-dependencies:
- dependency-name: 8398a7/action-slack
  dependency-version: 3.19.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Alan Dooley <[email protected]>

Author: dependabot[bot]

.github/workflows/build-push.yml

@@ -80,7 +80,7 @@ jobs:
     permissions: read-all
     steps:
       - name: Send notification
-        uses:  8398a7/action-slack@1750b5085f3ec60384090fb7c52965ef822e869e # v3.18.0
+        uses:  8398a7/action-slack@77eaa4f1c608a7d68b38af4e3f739dcd8cba273e # v3.19.0
         with: 
           status: custom
           custom_payload: |

.github/workflows/notification.yml

@@ -41,7 +41,7 @@ jobs:
             }
 
       - name: Send notification
-        uses: 8398a7/action-slack@1750b5085f3ec60384090fb7c52965ef822e869e # v3.18.0
+        uses: 8398a7/action-slack@77eaa4f1c608a7d68b38af4e3f739dcd8cba273e # v3.19.0
         with:
           status: custom
           custom_payload: |