Bump serde from 1.0.166 to 1.0.168

Bumps [serde](https://github.com/serde-rs/serde) from 1.0.166 to 1.0.168.
- [Release notes](https://github.com/serde-rs/serde/releases)
- [Commits](serde-rs/serde@v1.0.166...v1.0.168)

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

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

collectors/slurm/Cargo.toml

@@ -38,7 +38,7 @@ tracing = { version = "0.1", features = ["log"] }
 uuid = { version = "1.4", features = ["v4"] }
 fake = { version = "2.6", features = ["chrono"] }
 config = "0.13.2"
-serde = { version = "1.0.166", features = ["derive"] }
+serde = { version = "1.0.168", features = ["derive"] }
 serde-aux = "4.2.0"
 itertools = "0.11.0"
 regex = "1.9.1"