Update drink requirement from =0.5.4 to =0.6.0 (#1975)

Updates the requirements on [drink](https://github.com/Cardinal-Cryptography/drink) to permit the latest version.
- [Commits](https://github.com/Cardinal-Cryptography/drink/commits)

---
updated-dependencies:
- dependency-name: drink
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -39,7 +39,7 @@ cfg-if = { version = "1.0" }
 contract-build = { version = "3.2.0" }
 darling = { version = "0.20.3" }
 derive_more = { version = "0.99.17", default-features = false }
-drink = { version = "=0.5.4" }
+drink = { version = "=0.6.0" }
 either = { version = "1.5", default-features = false }
 funty = { version = "2.0.0" }
 heck = { version = "0.4.0" }