Make dependency on open-test-reporting-tooling-spi non-optional

Since the module descriptor requires it, it cannot be optional but must
be a regular dependency. Otherwise, using junit-platform-reporting on
the module path will fail.

(cherry picked from commit e886149)

Author: marcphilipp

junit-platform-reporting/junit-platform-reporting.gradle.kts

@@ -12,8 +12,9 @@ dependencies {
 	api(platform(projects.junitBom))
 	api(projects.junitPlatformLauncher)
 
+	implementation(libs.openTestReporting.tooling.spi)
+
 	compileOnlyApi(libs.apiguardian)
-	compileOnlyApi(libs.openTestReporting.tooling.spi)
 
 	shadowed(libs.openTestReporting.events)