Update toml requirement from 0.7 to 0.8

Updates the requirements on [toml](https://github.com/toml-rs/toml) to permit the latest version.
- [Commits](toml-rs/toml@toml-v0.7.0...toml-v0.8.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Cargo.toml

@@ -30,7 +30,7 @@ serde = "1.0.8"
 nom = "7"
 
 async-trait = { version = "0.1.50", optional = true }
-toml = { version = "0.7", optional = true }
+toml = { version = "0.8", optional = true }
 serde_json = { version = "1.0.2", optional = true }
 yaml-rust = { version = "0.4", optional = true }
 rust-ini = { version = "0.19", optional = true }