Remove unsafe from configuration-cache property in project template.

Author: ychescale9

src/functionalTest/kotlin/io/github/reactivecircus/appversioning/fixtures/ProjectTemplates.kt

@@ -26,7 +26,7 @@ fun settingsFileContent(
 fun gradlePropertiesFileContent(enableConfigurationCache: Boolean): String {
     val configurationCacheProperties = if (enableConfigurationCache) {
         """
-            org.gradle.unsafe.configuration-cache=true
+            org.gradle.configuration-cache=true
             org.gradle.unsafe.isolated-projects=true
         """.trimIndent()
     } else {