Bump act10ns/slack from 1 to 2

Bumps [act10ns/slack](https://github.com/act10ns/slack) from 1 to 2.
- [Release notes](https://github.com/act10ns/slack/releases)
- [Changelog](https://github.com/act10ns/slack/blob/master/RELEASE.md)
- [Commits](act10ns/slack@v1...v2)

---
updated-dependencies:
- dependency-name: act10ns/slack
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/pipeline.yml

@@ -453,7 +453,7 @@ jobs:
           SENTRY_ORG: sentry
           SENTRY_PROJECT: agent-operator
           SENTRY_URL: https://sentry.prod.dotnet.contsec.com
-      - uses: act10ns/slack@v1
+      - uses: act10ns/slack@v2
         with:
           status: ${{ job.status }}
           message: |-