Bump toml from 0.5.6 to 0.5.8

Bumps [toml](https://github.com/alexcrichton/toml-rs) from 0.5.6 to 0.5.8.
- [Release notes](https://github.com/alexcrichton/toml-rs/releases)
- [Commits](https://github.com/alexcrichton/toml-rs/compare/0.5.6...0.5.8)

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

Cargo.lock

@@ -412,9 +412,9 @@ dependencies = [
 
 [[package]]
 name = "toml"
-version = "0.5.6"
+version = "0.5.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ffc92d160b1eef40665be3a05630d003936a3bc7da7421277846c2613e92c71a"
+checksum = "a31142970826733df8241ef35dc040ef98c679ab14d7c3e54d827099b3acecaa"
 dependencies = [
  "serde",
 ]