build(deps): Bump rtCamp/action-slack-notify from e9db0ef to 2.1.1

Bumps [rtCamp/action-slack-notify](https://github.com/rtCamp/action-slack-notify) from e9db0ef to 2.1.1. This release includes the previously tagged commit.
- [Release notes](https://github.com/rtCamp/action-slack-notify/releases)
- [Commits](https://github.com/rtCamp/action-slack-notify/compare/e9db0ef...ecc1353ce30ef086ce3fc3d1ea9ac2e32e150402)

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

.github/workflows/e2e-nightly.yml

@@ -42,7 +42,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Notify Slack on failure
-        uses: rtCamp/action-slack-notify@e9db0ef
+        uses: rtCamp/action-slack-notify@ecc1353ce30ef086ce3fc3d1ea9ac2e32e150402
         env:
           SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
           SLACK_CHANNEL: tendermint-internal