Bump slog from 2.7.0 to 2.8.0

Bumps [slog](https://github.com/slog-rs/slog) from 2.7.0 to 2.8.0.
- [Release notes](https://github.com/slog-rs/slog/releases)
- [Changelog](https://github.com/slog-rs/slog/blob/master/CHANGELOG.md)
- [Commits](slog-rs/slog@v2.7.0...v2.8.0)

---
updated-dependencies:
- dependency-name: slog
  dependency-version: 2.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Cargo.lock

@@ -36,7 +36,7 @@ version = "1.0"
 features = [ "derive", "rc" ]
 
 [dependencies.slog]
-version = "2.7"
+version = "2.8"
 features = [ "max_level_trace", "release_max_level_debug" ]
 
 [dependencies.tokio]