Fix JaCoCo report location (#798)

This PR fixes the JaCoCo `report.xml` location, which accidentally
was `build))/reports/jacoco`.

PR: #798

build.gradle.kts

@@ -342,7 +342,7 @@ tasks {
 		enabled = !experimentalBuild
 		reports {
 			xml.required.set(true)
-			xml.outputLocation.set(file("${layout.buildDirectory}/reports/jacoco/report.xml"))
+			xml.outputLocation.set(layout.buildDirectory.file("reports/jacoco/report.xml"))
 		}
 	}