build(deps): bump akhileshns/heroku-deploy from 3.12.12 to 3.13.15 (#386

)

Bumps [akhileshns/heroku-deploy](https://github.com/akhileshns/heroku-deploy) from 3.12.12 to 3.13.15.
- [Release notes](https://github.com/akhileshns/heroku-deploy/releases)
- [Commits](AkhileshNS/heroku-deploy@v3.12.12...v3.13.15)

---
updated-dependencies:
- dependency-name: akhileshns/heroku-deploy
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/ci.yml

@@ -50,7 +50,7 @@ jobs:
     if: ${{ github.ref == 'refs/heads/main' && github.repository == '5e-bits/5e-srd-api' }}
     steps:
       - uses: actions/checkout@v3
-      - uses: akhileshns/heroku-deploy@v3.12.12
+      - uses: akhileshns/heroku-deploy@v3.13.15
         with:
           heroku_api_key: ${{secrets.HEROKU_API_KEY}}
           heroku_app_name: 'dnd-5e-srd-api'