.github: Bump slackapi/slack-github-action from 2.1.1 to 3.0.1

Bumps [slackapi/slack-github-action](https://github.com/slackapi/slack-github-action) from 2.1.1 to 3.0.1.
- [Release notes](https://github.com/slackapi/slack-github-action/releases)
- [Commits](91efab103c...af78098f53)

---
updated-dependencies:
- dependency-name: slackapi/slack-github-action
  dependency-version: 3.0.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/govulncheck.yml

@@ -24,7 +24,7 @@ jobs:
 
       - name: Post to slack
         if: failure() && github.event_name == 'schedule'
-        uses: slackapi/slack-github-action@91efab103c0de0a537f72a35f6b8cda0ee76bf0a # v2.1.1
+        uses: slackapi/slack-github-action@af78098f536edbc4de71162a307590698245be95 # v3.0.1
         with:
           method: chat.postMessage
           token: ${{ secrets.GOVULNCHECK_BOT_TOKEN }}

.github/workflows/installer.yml

@@ -120,7 +120,7 @@ jobs:
     steps:
       - name: Notify Slack of failure on scheduled runs
         if: failure() && github.event_name == 'schedule'
-        uses: slackapi/slack-github-action@91efab103c0de0a537f72a35f6b8cda0ee76bf0a # v2.1.1
+        uses: slackapi/slack-github-action@af78098f536edbc4de71162a307590698245be95 # v3.0.1
         with:
           webhook: ${{ secrets.SLACK_WEBHOOK_URL }}
           webhook-type: incoming-webhook

.github/workflows/test.yml

@@ -920,7 +920,7 @@ jobs:
       # By having the job always run, but skipping its only step as needed, we
       # let the CI output collapse nicely in PRs.
       if: failure() && github.event_name == 'push'
-      uses: slackapi/slack-github-action@91efab103c0de0a537f72a35f6b8cda0ee76bf0a # v2.1.1
+      uses: slackapi/slack-github-action@af78098f536edbc4de71162a307590698245be95 # v3.0.1
       with:
         webhook: ${{ secrets.SLACK_WEBHOOK_URL }}
         webhook-type: incoming-webhook