build(deps): bump slab from 0.4.11 to 0.4.12

Bumps [slab](https://github.com/tokio-rs/slab) from 0.4.11 to 0.4.12.
- [Release notes](https://github.com/tokio-rs/slab/releases)
- [Changelog](https://github.com/tokio-rs/slab/blob/master/CHANGELOG.md)
- [Commits](tokio-rs/slab@v0.4.11...v0.4.12)

---
updated-dependencies:
- dependency-name: slab
  dependency-version: 0.4.12
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Cargo.lock

@@ -380,7 +380,7 @@ shaq = { version = "0.2.0" }
 shuttle = "0.7.1"
 signal-hook = "0.3.18"
 siphasher = "1.0.1"
-slab = "0.4.11"
+slab = "0.4.12"
 smallvec = { version = "1.15.1", default-features = false, features = ["union"] }
 smpl_jwt = "0.7.1"
 socket2 = "0.6.1"