chore(deps): bump synchrony from 0.1.5 to 0.1.6

Bumps [synchrony](https://github.com/compio-rs/synchrony) from 0.1.5 to 0.1.6.
- [Commits](https://github.com/compio-rs/synchrony/commits/v0.1.6)

---
updated-dependencies:
- dependency-name: synchrony
  dependency-version: 0.1.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Cargo.lock

@@ -13,4 +13,4 @@ categories = ["data-structures", "memory-management"]
 readme = "README.md"
 
 [dependencies]
-synchrony = "0.1.5"
+synchrony = "0.1.6"