Bump Ilshidur/action-slack from 1.6.2 to 2.0.0

Bumps [Ilshidur/action-slack](https://github.com/ilshidur/action-slack) from 1.6.2 to 2.0.0.
- [Release notes](https://github.com/ilshidur/action-slack/releases)
- [Commits](Ilshidur/action-slack@1.6.2...2.0.0)

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

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

.github/workflows/dogfood.yml

@@ -38,14 +38,14 @@ jobs:
         run: echo "The dogfood branch was `${{ steps.dogfood.outputs.dogfood-branch }}` and its HEAD SHA1 was `${{ steps.dogfood.outputs.sha1 }}`"
       #slack notifications
       - name: Notify success on Slack
-        uses: Ilshidur/action-slack@1.6.2
+        uses: Ilshidur/action-slack@2.0.0
         env:
           SLACK_WEBHOOK: ${{ fromJSON(steps.secrets.outputs.vault).SLACK_WEBHOOK }}
           SLACK_OVERRIDE_MESSAGE: 'Dogfood build for `${{ steps.dogfood.outputs.sha1 }}`: *successful*'
         with:
           args: 'Succeed to build dogfood branch'
       - name: Notify failures on Slack
-        uses: Ilshidur/action-slack@1.6.2
+        uses: Ilshidur/action-slack@2.0.0
         if: failure()
         with:
           args: "Dogfood merge failed by {{ GITHUB_ACTOR }}, see {{ GITHUB_SERVER_URL }}/{{ GITHUB_REPOSITORY }}/actions/runs/{{ GITHUB_RUN_ID }}"