Update root project name in settings.gradle.kts

The root project name has been changed from "gradle-learn-project" to "YouCal". This is to reflect the proper naming convention of the projects and to improve overall readability.

settings.gradle.kts

@@ -35,7 +35,7 @@ gradleEnterprise {
   }
 }
 
-rootProject.name = "gradle-learn-project"
+rootProject.name = "YouCal"
 
 rootDir.toPath().listDirectoryEntries("yc-*")
   .filter { it.isDirectory() && !it.isHidden() }