Bump heroku-maven-plugin from 3.0.2 to 3.0.4
Bump heroku-maven-plugin from 3.0.2 to 3.0.4

Bumps [heroku-maven-plugin](https://github.com/heroku/heroku-maven-plugin) from 3.0.2 to 3.0.4.
- [Release notes](https://github.com/heroku/heroku-maven-plugin/releases)
- [Changelog](https://github.com/heroku/heroku-maven-plugin/blob/main/CHANGELOG.md)
- [Commits](https://github.com/heroku/heroku-maven-plugin/compare/heroku-sdk-parent-3.0.2...3.0.4)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
vatbub/tictactoe,vatbub/tictactoe