Bump ctest from 0.2.4 to 0.2.6

Bumps [ctest](https://github.com/alexcrichton/ctest) from 0.2.4 to 0.2.6.
- [Release notes](https://github.com/alexcrichton/ctest/releases)
- [Commits](https://github.com/alexcrichton/ctest/commits)

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

Author: dependabot-support

Cargo.lock

@@ -9,7 +9,7 @@ path = ".."
 default-features = false
 
 [build-dependencies]
-ctest = "0.2.3"
+ctest = "0.2.6"
 
 [features]
 default = [ "use_std" ]