Update toml requirement from 0.9 to 1.0 (#860)

Updates the requirements on [toml](https://github.com/toml-rs/toml) to permit the latest version.
- [Commits](toml-rs/toml@toml-v0.9.0...toml-v1.0.3)

---
updated-dependencies:
- dependency-name: toml
  dependency-version: 1.0.3+spec-1.1.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

cursive-core/Cargo.toml

@@ -48,7 +48,7 @@ features = ["local-offset", "formatting"]
 
 [dependencies.toml]
 optional = true
-version = "0.9"
+version = "1.0"
 
 [dependencies.num]
 default-features = false