github-actions(deps): bump github/accessibility-alt-text-bot

Bumps [github/accessibility-alt-text-bot](https://github.com/github/accessibility-alt-text-bot) from 1.3.0 to 1.4.0.
- [Release notes](https://github.com/github/accessibility-alt-text-bot/releases)
- [Commits](github/accessibility-alt-text-bot@v1.3.0...v1.4.0)

---
updated-dependencies:
- dependency-name: github/accessibility-alt-text-bot
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/a11y_alt_text_bot.yml

@@ -23,5 +23,5 @@ jobs:
     if: ${{ github.event.issue || github.event.pull_request || github.event.discussion }}
     steps:
       - name: Get action 'github/accessibility-alt-text-bot'
-        uses: github/accessibility-alt-text-bot@v1.3.0 # Set to latest
+        uses: github/accessibility-alt-text-bot@v1.4.0 # Set to latest