added anti sign edit

build.gradle

@@ -22,13 +22,13 @@ repositories {
 }
 
 dependencies {
-    compileOnly 'io.papermc.paper:paper-api:1.19.4-R0.1-SNAPSHOT'
+    compileOnly 'io.papermc.paper:paper-api:1.21.1-R0.1-SNAPSHOT'
     compileOnly 'org.geysermc.floodgate:api:2.2.2-SNAPSHOT'
     implementation 'org.apache.httpcomponents:httpclient:4.5.14'
     implementation 'com.sparkjava:spark-core:2.9.4'
 }
 
-def targetJavaVersion = 17
+def targetJavaVersion = 21
 java {
     def javaVersion = JavaVersion.toVersion(targetJavaVersion)
     sourceCompatibility = javaVersion