Bump github.com/apple/swift-log from 1.6.1 to 1.6.4 (#17)

Bumps [github.com/apple/swift-log](https://github.com/apple/swift-log) from 1.6.1 to 1.6.4.
- [Release notes](https://github.com/apple/swift-log/releases)
- [Commits](apple/swift-log@1.6.1...1.6.4)

---
updated-dependencies:
- dependency-name: github.com/apple/swift-log
  dependency-version: 1.6.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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