Update color-eyre requirement from 0.5 to 0.6

Updates the requirements on [color-eyre](https://github.com/yaahc/color-eyre) to permit the latest version.
- [Release notes](https://github.com/yaahc/color-eyre/releases)
- [Changelog](https://github.com/yaahc/color-eyre/blob/master/CHANGELOG.md)
- [Commits](https://github.com/yaahc/color-eyre/compare/v0.5.2...v0.6.0)

---
updated-dependencies:
- dependency-name: color-eyre
  dependency-type: direct:production
...

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

Cargo.toml

@@ -26,7 +26,7 @@ rand = "0.8"
 bincode = "1"
 criterion = "0.3"
 ed25519-zebra-legacy = { package = "ed25519-zebra", version = "1" }
-color-eyre = "0.5"
+color-eyre = "0.6"
 once_cell = "1.4"
 
 [features]