Bump toml from 0.5.5 to 0.5.6

Bumps [toml](https://github.com/alexcrichton/toml-rs) from 0.5.5 to 0.5.6.
- [Release notes](https://github.com/alexcrichton/toml-rs/releases)
- [Commits](https://github.com/alexcrichton/toml-rs/compare/0.5.5...0.5.6)

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

Cargo.lock

@@ -1329,9 +1329,9 @@ dependencies = [
 
 [[package]]
 name = "toml"
-version = "0.5.5"
+version = "0.5.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "01d1404644c8b12b16bfcffa4322403a91a451584daaaa7c28d3152e6cbc98cf"
+checksum = "ffc92d160b1eef40665be3a05630d003936a3bc7da7421277846c2613e92c71a"
 dependencies = [
  "serde",
 ]