chore(deps): update slackapi/slack-github-action action to v3 (#513)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [slackapi/slack-github-action](https://redirect.github.com/slackapi/slack-github-action) | action | major | `v2.1.1` → `v3.0.1` |

---

### Release Notes

<details>
<summary>slackapi/slack-github-action (slackapi/slack-github-action)</summary>

### [`v3.0.1`](https://redirect.github.com/slackapi/slack-github-action/releases/tag/v3.0.1)

[Compare Source](https://redirect.github.com/slackapi/slack-github-action/compare/v3.0.0...v3.0.1)

#### Breaking change: Node.js 24

This major version updates the minimum GitHub Actions runtime to **Node.js 24**. Most GitHub-hosted runners already include this, but self-hosted runners may need to be updated.

#### Run Slack CLI commands in your workflows

This release introduces a new technique for running [Slack CLI](https://docs.slack.dev/tools/slack-cli) commands directly in GitHub Actions workflows. Use `slackapi/slack-github-action/cli@v3.0.0` to install the CLI and execute commands like `deploy`, `manifest validate`, and more.

##### Validate an app manifest on pull requests

Check that your app manifest is valid before merging changes:

```yaml
- name: Validate the manifest
  uses: slackapi/slack-github-action/cli@v3.0.0
  with:
    command: "manifest validate --app ${{ vars.SLACK_APP_ID }}"
    token: ${{ secrets.SLACK_SERVICE_TOKEN }}
```

##### Deploy your app on push to main

Automate deployments whenever changes land on your main branch:

```yaml
- name: Deploy the app
  uses: slackapi/slack-github-action/cli@v3.0.0
  with:
    command: "deploy --app ${{ vars.SLACK_APP_ID }} --force"
    token: ${{ secrets.SLACK_SERVICE_TOKEN }}
```

Any command available in the Slack CLI can be passed through the `command` input — just omit the `slack` prefix.

The `token` input accepts a service token for authentication. You can gather this token by running [`slack auth token`](https://docs.slack.dev/tools/slack-cli/reference/commands/slack_auth_token) with the Slack CLI and storing the value as a repository secret.

***

For full documentation on the CLI technique and other sending techniques, check out the [docs](https://docs.slack.dev/tools/slack-github-action) 📚

### [`v3.0.0`](https://redirect.github.com/slackapi/slack-github-action/compare/v2.1.1...v3.0.0)

[Compare Source](https://redirect.github.com/slackapi/slack-github-action/compare/v2.1.1...v3.0.0)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] If you want to rebase/retry this PR, check this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/). View the [repository job log](https://developer.mend.io/github/rapidsai/shared-workflows).

Authors:
  - https://github.com/apps/renovate

Approvers:
  - James Lamb (https://github.com/jameslamb)

URL: #513

Author: renovate[bot]

.github/workflows/breaking-change-alert.yaml

@@ -124,7 +124,7 @@ jobs:
           fi
 
       - name: Send Slack notification
-        uses: slackapi/slack-github-action@91efab103c0de0a537f72a35f6b8cda0ee76bf0a # v2.1.1
+        uses: slackapi/slack-github-action@af78098f536edbc4de71162a307590698245be95 # v3.0.1
         with:
           payload: |
             {