Update cargo requirement from 0.93.0 to 0.94.0

Updates the requirements on [cargo](https://github.com/rust-lang/cargo) to permit the latest version.
- [Changelog](https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md)
- [Commits](rust-lang/cargo@0.93.0...0.94.0)

---
updated-dependencies:
- dependency-name: cargo
  dependency-version: 0.94.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Cargo.toml

@@ -28,7 +28,7 @@ name = "cargo-ctest"
 path = "src/bin/ctest.rs"
 
 [dependencies]
-cargo = "0.93.0"
+cargo = "0.94.0"
 cargo-util = "0.2"
 semver = "1.0.3"
 log = "0.4"