fix deprecation

build.gradle

@@ -141,14 +141,9 @@ dependencies {
 
 def targetJavaVersion = 21
 tasks.withType(JavaCompile).configureEach {
-    // ensure that the encoding is set to UTF-8, no matter what the system default is
-    // this fixes some edge cases with special characters not displaying correctly
-    // see http://yodaconditions.net/blog/fix-for-java-file-encoding-problems-with-gradle.html
-    // If Javadoc is generated, this must be specified in that task too.
     it.options.encoding = "UTF-8"
-    if (targetJavaVersion >= 10 || JavaVersion.current().isJava10Compatible()) {
-        it.options.release = targetJavaVersion
-    }
+    it.options.release = targetJavaVersion
+    it.options.deprecation = true
 }
 
 java {