build(deps): bump axum from 0.6.3 to 0.6.4 (#600)

Bumps [axum](https://github.com/tokio-rs/axum) from 0.6.3 to 0.6.4.
- [Release notes](https://github.com/tokio-rs/axum/releases)
- [Changelog](https://github.com/tokio-rs/axum/blob/main/CHANGELOG.md)
- [Commits](https://github.com/tokio-rs/axum/compare/axum-v0.6.3...axum-v0.6.4)

---
updated-dependencies:
- dependency-name: axum
dependency-type: direct:production
update-type: version-update:semver-patch
...

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