ci: bump Ilshidur/action-discord from 0.3.2 to 0.4.0

Bumps [Ilshidur/action-discord](https://github.com/ilshidur/action-discord) from 0.3.2 to 0.4.0.
- [Release notes](https://github.com/ilshidur/action-discord/releases)
- [Commits](https://github.com/ilshidur/action-discord/compare/0.3.2...0.4.0)

---
updated-dependencies:
- dependency-name: Ilshidur/action-discord
  dependency-version: 0.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/issues.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Post to discord
-        uses: Ilshidur/action-discord@0.3.2
+        uses: Ilshidur/action-discord@0.4.0
         env:
           DISCORD_WEBHOOK: ${{ secrets.DISCORD_WEBHOOK_ISSUES }}
           ACTION: ${{ github.event.action }}