Bump junit-jupiter-api from 5.6.0 to 5.7.1 in /app (#6)

Bumps [junit-jupiter-api](https://github.com/junit-team/junit5) from 5.6.0 to 5.7.1.
- [Release notes](https://github.com/junit-team/junit5/releases)
- [Commits](junit-team/junit-framework@r5.6.0...r5.7.1)

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