chore(deps): update akhileshns/heroku-deploy action to v3.14.15

Author: renovate[bot]

.github/workflows/deployment.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: akhileshns/heroku-deploy@v3.12.12
+      - uses: akhileshns/heroku-deploy@v3.14.15
         with:
           heroku_api_key: ${{secrets.HEROKU_API_KEY}}
           heroku_app_name: "opencov-reloaded" #Must be unique in Heroku