Use newer gradle syntax

app/build.gradle

@@ -14,10 +14,10 @@ android {
 
 	defaultConfig {
 		applicationId 'org.koitharu.kotatsu'
-		minSdkVersion 21
+		minSdk = 21
-		targetSdkVersion 34
+        targetSdk = 34
-		versionCode 570
+        versionCode = 570
-		versionName '6.0-a1'
+        versionName = "6.0-a1"
 		generatedDensities = []
 		testInstrumentationRunner "org.koitharu.kotatsu.HiltTestRunner"
 		ksp {

build.gradle

@@ -21,6 +21,6 @@ allprojects {
 	}
 }
 
-task clean(type: Delete) {
+tasks.register('clean', Delete) {
     delete rootProject.buildDir
 }