Bump 8398a7/action-slack from 3.9.3 to 3.15.1 (#110)

Bumps [8398a7/action-slack](https://github.com/8398a7/action-slack) from 3.9.3 to 3.15.1.
- [Release notes](https://github.com/8398a7/action-slack/releases)
- [Commits](8398a7/action-slack@047b09b...fbd6aa5)

---
updated-dependencies:
- dependency-name: 8398a7/action-slack
  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>

.github/workflows/release.yaml

@@ -92,7 +92,7 @@ jobs:
         with:
           artifact-name: sbom.spdx.json
 
-      - uses: 8398a7/action-slack@047b09b154480ed39076984b64f324fff010d703 #v3.9.3
+      - uses: 8398a7/action-slack@fbd6aa58ba854a740e11a35d0df80cb5d12101d8 #v3.15.1
         with:
           status: ${{ job.status }}
           fields: repo,workflow,action,eventName