Update cursive requirement from 0.20 to 0.21

Updates the requirements on [cursive](https://github.com/gyscos/cursive) to permit the latest version.
- [Release notes](https://github.com/gyscos/cursive/releases)
- [Changelog](https://github.com/gyscos/cursive/blob/main/CHANGELOG.md)
- [Commits](gyscos/cursive@cursive-v0.20.0...cursive-v0.21.1)

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

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

Author: dependabot[bot]

Cargo.toml

@@ -7,7 +7,7 @@ license = "MIT OR Apache-2.0"
 edition = "2021"
 
 [dependencies]
-cursive = "0.20"
+cursive = "0.21"
 regex = "1"
 
 [profile.release]