Update toml requirement from 0.4.6 to 0.5.0

Updates the requirements on [toml](https://github.com/alexcrichton/toml-rs) to permit the latest version.
- [Release notes](https://github.com/alexcrichton/toml-rs/releases)
- [Commits](https://github.com/alexcrichton/toml-rs/compare/0.4.6...0.5.0)

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

Cargo.toml

@@ -21,7 +21,7 @@ serde_qs = "0.4.5"
 url = "1"
 tap-reader = "1"
 try_from = "0.3.2"
-toml = { version = "0.4.6", optional = true }
+toml = { version = "0.5.0", optional = true }
 hyper-old-types = "0.11.0"
 envy = { version = "0.4.0", optional = true }