chore(deps): bump axum to 0.8.1

[SHAcollision]

Latest pubky-core conflicts in version of bytes with axum 0.7.9 . This can be fixed by upgrading to axum 0.8.0 which required:

1. Bumping utoipa to latest commit in main.
2. Do the same in pubky-app-specs repo.
3. Changing how params in endpoints are prefixed. Axum 0.8 changes :param to {param} so our macro for swagger/axum is not needed anymore.

Pre-submission Checklist

For tests to work you need a working neo4j and redis instance with the example dataset in docker/db-graph

• Testing: Implement and pass new tests for the new features/fixes, cargo test.
• Performance: Ensure new code has relevant performance benchmarks, cargo bench