chore: テスト同時実行数の設定を修正

build.gradle.kts

@@ -1,6 +1,6 @@
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 import org.openapitools.generator.gradle.plugin.tasks.GenerateTask
-import kotlin.math.min
+import kotlin.math.max
 
 val ktor_version: String by project
 val kotlin_version: String by project
@@ -29,7 +29,7 @@ version = "0.0.1"
 tasks.withType<Test> {
     useJUnitPlatform()
     val cpus = Runtime.getRuntime().availableProcessors()
-    maxParallelForks = min(1, cpus - 1)
+    maxParallelForks = max(1, cpus - 1)
     setForkEvery(4)
 }